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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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 veins that link two capillary systems are called ________.
Fill in the blank(s) with the appropriate word(s).
The main hormone secreted by a corpus luteum is:
a. Human chorionic gonadotropin b. Luteinizing hormone c. Oxytocin d. Progesterone e. Prolactin
Aldosterone is produced by the
A. adrenal medulla. B. adrenal cortex. C. hypothalamus. D. posterior pituitary.