The tricuspid valve is closed
A. during passive filling of the ventricles.
B. when the mitral valve is open.
C. while the atria are contracting.
D. during ejection.
E. during active filling of the ventricles.
Answer: D
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What is the primary function of the large intestine?
A. Protein digestion and nutrient absorption B. Storage of vitamins and minerals C. Secretion of water, salts, sodium bicarbonate, and enzymes D. Water and electrolyte absorption E. None of the choices is correct.
A lack of noise in the intestinal tract could represent ________________________________________ feces
Fill in the blank(s) with correct word
The temperature control center within the anterior region of the hypothalamus is activated by ______ and initiates reflexes that mediate ______
a. cold; heat production and heat conservation b. cold; heat loss c. warmth; heat loss d. warmth; heat production and heat conservation e. warmth; vasoconstriction
Which statement about endochondral ossification is true?
A. It forms the long bones, vertebrae, ribs, sternum, scapula, pelvis, and limb bones of the developing fetus. B. Osteoblasts deposit bone in membranes. C. It forms the bones of the skull in the developing fetus. D. The site of ossification is the center of future bone.