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Skeletal muscle is composed of myofibrils. The myofibrils contain repeating units called sarcomeres. This also called the operational units. The sarcomeres contain actin filaments and myosin filaments. The a...

The right ventricle only pumps blood to the lungs, which are very near the heart. The left ventricle needs to pump blood to the eintire body, so the greater distance requires higher pressure to make sure the...

Enzymes are proteins that catalyze nearly all reactions that go on in your body that would otherwise be too slow for survival. The substances or molecules that enzymes catalyze are called substrates , and th...

They squeeze through the walls of blood capillaries, moving through tissues to reach the site of infection. Phagocytes ingest pathogens by endocytosis (phagocytosis), a non-specific immunity, which doesn't d...

Arteries carry bloock away from the heart, towards bodyily tissues. They have thick walls to withstand high pressures, a narrow lumen to maintain high pressures and a thick layer of elastic fibres to maintai...