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vc a&p study guide
vc lvn study guide chapter 18
| Question | Answer |
|---|---|
| structure of arteries | - thick muscular walls - small lumen - pushes blood along by contraction (hence our pulses) |
| blood pressure in the arteries | must maintain high pressure to keep blood flowing through the circulatory system |
| State the pathway of the pulmonary circulation from the heart to the lungs and back to the heart. | the flow of blood from the right ventricle through the pulmonary artery to the lungs, where carbon dioxide is exchanged for oxygen, and back through the pulmonary vein to the left atrium. |
| What is the pacemaker of the heart? | SA (sinoatrial valve) |
| How does blood move in the capillaries? | pulse waves gradually dissipates as it travels through the circulatory system disappearing entirely |
| structure of veins | - have valves to prevent back flow of blood - thinner walls, - wider lumen |
| structure of capilla | - one cell thick - smaller than veins and arteries - don't have valves or muscular walls |
| blood pressure in the veins | blood flow and venous return use stress-relaxation effect to maintain a relatively steady state |
| Where does it exchange? capillaries >nutrients< tissue | within capillary beds |
| Where does it exchange? capillaries >oxygen< tissue | within the lungs |
| Where does it exchange? capillaries >waste products< tissue | waste products are eventually eliminated from the bloodstream by the liver, kidneys, and lungs. |
| Where does it exchange? capillaries >CO2< tissue | peripheral tissues release CO2 |
| urium & amino acids | waste of cells |
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