The tricuspid valve is closed
A. during active filling of the ventricles.
B. when the mitral valve is open.
C. while the atria are contracting.
D. during ejection.
E. during passive filling of the ventricles.
D
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Which of the following describes the major significance of the element carbon in the human body?
a) ionized form makes body fluids acidic b) constituent of water c) forms backbone of all organic molecules d) required to harden the structure of bones and teeth e) ionized form is the part of hemoglobin that carries oxygen
Which of the following is a contraceptive method that not only prevents fertilization but also provides protection against sexually transmitted diseases?
A. Oral contraceptives B. Diaphragm C. Spermicidal agents D. Condom
A neuroglial cell ________
A) supports neurons B) conducts electrical impulses along axons C) receives electrical impulses from sensory organs D) conducts electrical impulses between neurons
Renin converts
A. angiotensin I to angiotensin II. B. angiotensin II to angiotensin I. C. angiotensinogen to angiotensin I. D. angiotensin II to angiotensin III. E. angiotensinogen to angiotensin II.