Opening of each of the following types of channels will contribute toward a graded potential except
A) closed voltage-gated sodium channel.
B) chemically gated acetylcholine receptor.
C) sodium leak channel.
D) mechanically gated sodium channel.
E) inactivated voltage-gated sodium channel.
Answer: E
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The veins that link two capillary systems are called ________.
Fill in the blank(s) with the appropriate word(s).
Aldosterone is produced by the
A. adrenal medulla. B. adrenal cortex. C. hypothalamus. D. posterior pituitary.
Consider the equation F = ?P/R. It describes the flow (F) of fluid in a tube in which there is a pressure difference (?P) between the two ends and a resistance (R) to flow. Based on this equation, which is a correct conclusion?8-15-2013
A. If both the resistance and the pressure gradient in a tube increase, the flow must also increase. B. The flow of fluid in a tube depends upon the absolute pressure at the beginning of the tube. C. The greater the resistance to flow in a tube, the greater the rate of flow for any given pressure difference. D. The rate of flow in a tube will decrease if the resistance to flow is decreased. E. The rate of fluid flow in a tube will increase if the pressure at the beginning is increased while the pressure at the end of the tube stays the same.
The main hormone secreted by a corpus luteum is:
a. Human chorionic gonadotropin b. Luteinizing hormone c. Oxytocin d. Progesterone e. Prolactin