The tricuspid valve is closed ________.
A) while the ventricle is in diastole
B) when the ventricle is in systole
C) while the atrium is contracting
D) by the movement of blood from atrium to ventricle
B) when the ventricle is in systole
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Which of the following is not a function of the sebum?
A) It inhibits growth of bacteria. B) It lubricates the hair shaft. C) It conditions the surrounding skin. D) It helps the skin shed excess heat. E) It protects the hair shaft.
In comparison to a vessel with a large diameter, a vessel with a small diameter has
A) less resistance to blood flow. B) the same amount of pressure as resistance. C) a greater resistance to blood flow. D) a higher blood pressure. E) a greater blood flow.
Trypsin:
a. is important in protein digestion b. works in the stomach c. is made in the liver d. all of the above
Megakaryocytes are specialized cells of the bone marrow responsible for:
engulfing invading bacteria production of scar tissue in an injured area formation of platelets specific immune responses All of the choices are correct