Lecciones de 6to Grado

A detailed illustration showing a person having their blood pressure taken with a cuff on the arm and a pulse being checked at the wrist.

A cross-section of skin showing sweat glands, blood vessels, and hair follicles with animated steam representing sweat evaporation and arrows showing blood flow changes.

A split-panel close-up showing intact skin surface, mucus-lined nasal passage, and rapidly waving cilia in the bronchial tract, with Medi in a lab coat standing in the center holding a glowing shield labeled First Line of Defense.

An illustrated animation showing the pituitary gland releasing growth hormone into the bloodstream, with growing bones and muscles highlighted in a human figure.

A colorful cross-section of the human body showing skeletal muscles attached to bones, the heart with cardiac muscle highlighted, and smooth muscles lining internal organs like the stomach and intestines.

An illustrated diagram showing the peripheral nervous system with nerves branching out from the spinal cord to limbs and organs, alongside a highlighted reflex arc pathway demonstrating a knee-jerk reflex.

A detailed cross-section of lungs showing alveoli with oxygen entering the blood and carbon dioxide leaving, plus a zoomed-in view of capillaries exchanging gases with body cells.

A vivid 3D model of the DNA double helix showing the sugar-phosphate backbone and paired nitrogenous bases (adenine-thymine, cytosine-guanine) with labels and arrows illustrating base pairing.

A vibrant 3D cross-section of a human cell with the glowing nucleus at center, mitochondria scattered throughout jelly-like cytoplasm, and a detailed bilayer cell membrane forming the boundary, while Medi points to the nucleus with a long pointer stick.

A colorful pyramid infographic where Medi points upward through four rising tiers labeled cells, tissues, organs, and organ systems, each tier illustrated with vivid human body examples connected by upward arrows showing increasing complexity.

A bright clinic with labeled lung models and rows of inhalers on shelves, where Medi points to a side-by-side diagram comparing the dramatically narrowed inflamed airways of asthma against mucus-choked bronchial tubes in acute bronchitis.

An anatomical illustration of the female reproductive system with clearly labeled arrows pointing to the ovaries, fallopian tubes, uterus, cervix, and vagina, while Medi stands beside the diagram holding a pointer and a phase chart of the menstrual cycle.

A microscopic field revealing biconcave red blood cells, irregularly shaped white blood cells, tiny disc-like platelets, and pale straw-colored plasma filling the background, with Medi holding a magnifying glass over the sample and labeled callout arrows identifying each component.

A grid of four microscopic panels showing epithelial tissue as a smooth continuous protective sheet, connective tissue with dense collagen fibers, a cross-section of striated contracting muscle fibers, and a branching neuron network for nervous tissue, with Medi at center explaining each panel.

A color-coded layered anatomical figure displaying each body system in a distinct hue — skeletal in white, muscular in red, circulatory in blue and red, respiratory in light blue, digestive in green, and nervous in yellow — with Medi holding a matching color-coded legend and pointer.

A detailed human skeleton diagram with labeled bones and glowing joint regions highlighted in gold, with rotating 3D bone models in the foreground and Medi pointing to the hip's ball-and-socket joint to demonstrate its wide range of motion.

A detailed cross-section of human skin revealing the thin stratum corneum at the surface, the epidermis packed with layered keratinocytes, the dermis housing coiled sweat glands, hair follicles, and capillary networks, and the fatty hypodermis cushioning at the base, with Medi pointing to each labeled layer using a magnifying lens.

A colorful cross-section of the human digestive system showing the mouth, stomach, pancreas, and intestines with labeled enzymes like amylase, protease, and lipase acting on different foods.

A bright classroom lined with human body posters and scale models, a labeled skeleton standing in the corner, a heart-pumping-blood diagram projected on the board, and Medi holding a long pointer ready to explain structure and function.

A transparent human body model glowing under bright lab lights with four color-coded regions: the skull highlighted blue for the cranial cavity, the ribcage region in pink for the thoracic cavity, the abdomen in yellow, and the lower pelvis in green, each showing floating organ icons in their correct positions.

A vibrant diagram showing the human body with major endocrine glands highlighted: pituitary, thyroid, adrenal glands, pancreas, and ovaries/testes, with arrows indicating hormone release and target organs.

A colorful cross-section illustration of a neuron showing the cell body, dendrites, axon, myelin sheath, and synapse with labeled parts, set against a backdrop of a nerve network.

A dynamic split-panel illustration with a sweating figure standing in bright summer heat on the left, a shivering figure in a snowy winter scene on the right, and a central clinical thermometer reading 37 degrees C, with labelled arrows pointing to sweat glands and dilated blood vessels on one side and constricted vessels on the other.

A bright hospital room with a bandaged forearm resting on a bed, and a four-panel wound-healing diagram on the wall showing a bleeding cut sealed by a clot, inflamed tissue crowded with white blood cells, fresh pink tissue filling the gap, and finally smooth healed skin with a faint scar.

A glowing anatomical cross-section of the human torso showing branching pale-green lymph vessels running from the limbs toward the chest, enlarged oval lymph nodes visible at the neck, armpits, and groin, the dark-red spleen nestled behind the stomach on the left, and a thymus shown in the upper chest.

An animated image showing the diaphragm’s movement downward during inhalation and upward during exhalation, with arrows indicating air flow in and out of the lungs, and muscles highlighted.

A detailed, colorful 3D cross-section image of the human lungs showing the trachea, bronchi, bronchioles, alveoli, and surrounding blood vessels with labels.

A detailed, labeled 3D illustration of the human brain showing the cerebrum, cerebellum, and brainstem, alongside the spinal cord extending down the vertebral column, with colorful neural pathways.

A colorful diagram of a human figure showing changes in bones, muscles, skin, and organs with age, surrounded by icons representing activities like walking, memory, and heart function.

A microscopic scene inside a blood vessel where large translucent phagocytes extend pseudopodia to engulf rod-shaped bacteria, while smaller round lymphocytes cluster nearby releasing tiny antibody symbols, all depicted against a bright-red flowing blood background.

An anatomical illustration comparing three blood vessel cross-sections side by side: a thick-walled elastic artery in bright red, a thinner-walled vein in blue with a visible leaflet valve preventing backflow, and a single-cell-thick capillary positioned beside a tissue cell exchanging oxygen molecules and carbon dioxide.

A medical clinic with illuminated X-ray light boxes showing a cross-section of porous, thinned bone on the left representing osteoporosis alongside a diagram of an inflamed swollen knee joint with cartilage wear on the right, with a bone-density comparison chart between a healthy and an affected femur displayed at the centre.

A detailed cross-section image of the human digestive system showing the stomach, intestines, blood vessels, and liver, with animated arrows illustrating nutrient absorption and transport to cells.

A magnified virtual-microscope view of a human cell showing a large blue nucleus at the centre surrounded by clear cytoplasm, purple oval mitochondria scattered throughout, a green endoplasmic reticulum network nearby, and a clearly defined cell membrane forming the entire boundary of the cell.

An illustrated scene showing a syringe injecting a vaccine into an arm, with animated immune cells like white blood cells identifying and remembering pathogens, and a shield icon symbolizing immunity.

A colourful genetics laboratory with a glowing blue DNA double-helix model at the centre, a digital screen showing 23 pairs of human chromosomes in different sizes, gene segment brackets highlighted on the helix strands, and an allele colour-code chart on the wall beside Medi holding a Punnett square diagram.

A detailed anatomical illustration of the urinary system showing two dark-red bean-shaped kidneys flanking the lumbar spine, a magnified inset of a nephron tubule colour-coded by filtration zone, yellow ureters descending to a translucent cross-section of the bladder, and the urethra exiting at the bottom.

A microscopic view of a muscle sarcomere showing alternating dark myosin thick filaments and lighter actin thin filaments arranged in precise bands, with small animated arrows showing myosin heads forming cross-bridges and pulling actin filaments inward to shorten the sarcomere, and ATP molecules depicted near each myosin head.

A detailed anatomical cutaway of the human ear showing the curved fleshy pinna on the outside, a narrow ear canal leading inward to a taut oval eardrum membrane, three tiny ossicle bones bridging the air-filled middle ear space, a fluid-filled spiral cochlea in the inner ear, and the auditory nerve cable exiting toward the brain.

An animated anatomical diagram comparing three joint types side by side: a tightly interlocked skull suture labelled as fibrous with zero movement, a spinal intervertebral disc labelled as cartilaginous with limited movement arrows, and a cut-open knee joint filled with glistening synovial fluid labelled as synovial with broad sweeping movement arrows.

Medi the friendly anatomy guide stands beside a glowing four-step staircase inside a science lab, pointing at a labeled human-body diagram showing the stomach, its muscle layers, and a full digestive system diagram on the wall behind.

A large detailed anatomical heart diagram opened to reveal all four chambers, with blue arrows tracing deoxygenated blood from the right atrium through the right ventricle into the pulmonary artery toward the lungs, and red arrows showing oxygenated blood returning to the left atrium and being forcefully pumped by the left ventricle out through the aorta.

Medi the explorer stands beside a giant glowing map of the human body, tracing red and blue river-like vessels that loop from a steadily beating heart out to tiny cells and back again, pointing excitedly at the two great circuits branching off in different directions.

Medi the guide stands beside a glowing human-body diagram in a bright science lab, pressing signal arrows from the brain outward to the skin, glands, and blood vessels while pointing at a thermostat on the wall.

A sunny park scene with a runner on a paved path, a close-up circular inset showing red-highlighted micro-tears in skeletal muscle fibres from the training stimulus, and a second inset of a cross-sectioned heart with elevated-rate arrows indicating increased stroke volume and cardiac output during sustained aerobic exercise.

Medi the friendly explorer holds a glowing lantern inside a giant cutaway model of the human body, pointing to each organ as a sandwich travels from the mouth through the esophagus and stomach down to the small intestine, then watching a stream of nutrients flow through the blood to reach glowing cells.

A colorful diagram of a human arm with a hand touching a hot surface, showing the path of a nerve impulse from sensory neuron to spinal cord interneuron to motor neuron, with animated electrical signals.

Medi stands inside a glowing cross-section of the small intestine, surrounded by labeled sections of the GI tract from mouth to large intestine, holding up a glowing enzyme molecule whose active site perfectly cradles a starch chain, while tiny glucose and maltose pieces drift away into the intestinal wall behind her.

A cross-section of the human body displaying three microscopic muscle tissue samples under magnification: striated banded skeletal muscle fibres attached to a bone tendon at the top, smooth spindle-shaped cells forming the curved wall of the intestine in the middle, and tightly interlocked cardiac muscle fibres with intercalated discs forming the heart wall at the bottom.

A colorful, labeled diagram of the digestive system showing mouth, esophagus, stomach, small intestine, large intestine, liver, pancreas, and gallbladder with brief function notes.

A human body diagram overlaid with four homeostatic feedback icons: the hypothalamus region of the brain glowing as a thermostat with a set-point arrow, sweat glands activated along the skin surface with droplet symbols, blood vessels widening near the skin surface for heat release, and skeletal muscles contracting in short bursts labelled as shivering to produce warmth.

Medi stands at the entrance of a grape-cluster-shaped air sac deep inside a lung, holding a glowing oxygen molecule and pointing to the paper-thin wall where tiny capillaries wrap around it like a net.

Medi stands inside a giant glowing model of a human heart, holding a bright red lantern in one hand and a deep crimson lantern in the other, tracing the two looping pathways of blood as they flow through chambers and out to the lungs and body.

Medi stands inside a giant transparent model of a human body, adjusting dials on a glowing control panel while sweat droplets and tiny thermometers float around them, illustrating the body's moment-by-moment self-regulation.

Medi the guide stands beside a giant glowing thermostat-and-body diagram, pointing as arrows loop between brain, skin, heart, and lungs in a softly lit lab.

Medi stands at a giant cutaway model of a human forearm, pointing to a glowing cross-section that shows skin, then a river of blood vessels underneath, while tiny animated bacteria bounce off the outer surface and a glowing white blood cell races toward one that slipped through a cut.