Which cells fight infection by producing antibodies?
A. T cells
B. Macrophages
C. Natural killer cells
D. Eosinophils
E. B cells
Answer: E
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Estrogen exerts a ________ influence on the hypothalamus, increasing secretion of ________ and thus increasing LH and FSH secretion.
A. negative; GnRH B. positive; progesterone C. negative; progesterone D. positive; GnRH
Answer the following statements true (T) or false (F)
1. Vitreous humor is the thick fluid in the posterior chamber of the eye. 2. The potentially blinding condition called glaucoma can occur if the fluid pressure of the eye drops too low. 3. The optic disc is able to respond only to bright light. 4. The nerve impulse of the eye begins when light enters through the iris of the eye and ends in the occipital lobe of the brain. This is called the visual pathway. 5. The external ear has two parts, the auricle and the pinna.
Bicarbonate must be converted to ________ to move into tubule cells and reduce blood pH.
A. carbon dioxide B. carbonic anhydrase C. carbonic acid D. None of the choices are correct.
The arrector pili muscle contracts and pulls hairs upright when we are cold or frightened
Indicate whether the statement is true or false