What are the primary components of a cardiovascular system? What diffusion-related problem is solved by having a cardiovascular system?
What will be an ideal response?
Primary components are the heart (a pump), the blood, and the vessels, which include arteries, capillaries, and veins. The cardiovascular system solves the problem of inefficient diffusion over large distances by providing a force for the blood and a system of vessels leading to capillaries, which are distributed at a high density throughout all the organs. No living cell is more than a short distance from a capillary.
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Which statement is not true?
A. During ventricular systole, the pulmonary semilunar valve is open. B. During ventricular systole, the atria are filling with blood. C. During ventricular systole, the bicuspid valve is open. D. During ventricular systole, the aortic semilunar valve is open. E. During ventricular systole, the tricuspid valve is closed.
Maintaining the body's internal environment within certain narrow ranges is called ____________________
Fill in the blank(s) with correct word
If one nerve stimulus arrives at a muscle fiber so soon that the fiber has only partially relaxed from the previous twitch, the most likely result will be ________.
A. flaccid paralysis B. complete tetanus C. fatigue D. incomplete tetanus E. spasm
Branches of the subclavian arteries carry blood on the way to the brain, neck and shoulder muscles, and mammary glands
Indicate whether this statement is true or false.