Physiology 2130 Lecture Notes - Lecture 9: Pulmonary Circulation, Blood Vessel, Gas Exchange
20 Jul 2017
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Module 9 circulatory system ii: blood vessels. Anatomy general organization: blood vessels: pumps and distributes blood to all areas of body. Circulatory system divided into: pulmonary circulation, systemic circulation. Capillaries are the smallest of all the blood vessels and are functional units of circulatory system where substances enter/leave. Two principal loops blood takes through the body: pulmonary circulation: begins on right side of heart and sending blood through arteries to lungs. These blood vessels continually branch into smaller and smaller blood vessels, eventually becoming capillaries. Oxygen diffuses into blood and carbon dioxide out. Blood enters venules and progressively larger veins eventually returning to left side of heart: systematic circulation: begins on left side of heart. Freshly oxygenated blood now pumped to rest of body; travels from left ventricle, through aorta, and into arteries. Arteries branch into smaller arterioles, branching into capillaries. Oxygen, nutrients, hormones, etc. are delivered to cells, and carbon dioxide (co2) and waste picked up.
