❒ Know This (?) The heart can beat all by itself even after being separated from the body. Blood is carried throughout the body through the capillaries, while the coronary arteries supply blood to the heart. The heart pumps and circulates blood through the body, following a contraction-relaxation cycle. The heart is the most active muscular organ, residing marginally on the left section of the body that tirelessly supplies blood to the entire system. If they stretched into a line, placed end to end, the distance they would cover would be approximately 2400 km! ❒ Know This (?) As astounding as it may sound, the lungs consist of over 300,000 capillaries. As oxygen penetrates the alveoli, the carbon dioxide is extricated from the blood as we exhale. When oxygen passes through the trachea into the lungs, it goes through tiny air sacs called alveoli. The trachea – also known as the windpipe – serves as the passageway for inhalation. Regarded as the most vital organ of the respiratory system, a pair of lungs is located inside the chest, their primary function being the release of oxygen into the blood and extricating carbon dioxide from the blood. Know that the brain has four sections: the cerebrum, cerebellum, diencephalon, and brain stem. Marked by folds that meander through the surface area of the brain, the signals in the form of information, are passed from the brain as they navigate through the spinal cord, and then transported to other parts of the body. The brain aids us to think, comprehend, and create.
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