Increasing the time when all heart valves are closed ____________________ the length of time that a lub heart sound lasts
Fill in the blank(s) with correct word
has no effect on
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Which of the following is true of an artery?
A) It has a relatively thick media. B) The histological structure permits a two-way exchange of substances between the blood and body cells. C) The vessel walls are relatively thin. D) Blood flow is the slowest of all classes of vessels. E) All of the answers are correct.
When activated becomes a macrophage that fights infection.
A) Neutrophil B) Monocyte C) Eosinophil D) Lymphocyte
The orbicularis oris muscle
A. puckers the mouth for kissing. B. contributes to pouting. C. contributes to laughing and smiling. D. causes crow's feet wrinkles. E. raises the eyelid.
Which of the following gives a cell structural support, determines its shape, and moves substances within it?
A. The cytoskeleton B. The Golgi complex C. The nucleus D. Cholesterol E. The plasma membrane