Question

71. Which of the following mechanisms help to maintain body temperature on hot days? a. skin vasodilation b. decreased muscle tone c. Sweating d. all of these 72. The temperature control center within the anterior region of the hypothalamus is activated by and initiates reflexes that mediate a. warmth; heat loss b. warmth; heat production and heat conservation c. cold; heat production and heat conservation d. cold; heat loss 73. The cells of excitable and nonexcitable tissues share a. a resting membrane potential b. a threshold potential c. an ability to open the Na$^+$ gates d. all of these 74. A threshold potential is a. the peak potential achieved during an action potential b. the potential achieved when two opposing forces acting upon an ion (concentration and electrical gradients) achieve a state of equilibrium c. the potential at which K$^+$ permeability increases d. the point at which there is an explosive increase in Na$^+$ or Ca$^{2+}$ permeability is affected by which of the following?

          71. Which of the following mechanisms help to maintain body temperature on hot days?
a. skin vasodilation
b. decreased muscle tone
c. Sweating
d. all of these
72. The temperature control center within the anterior region of the hypothalamus is activated by ______ and initiates reflexes that mediate ______
a. warmth; heat loss
b. warmth; heat production and heat conservation
c. cold; heat production and heat conservation
d. cold; heat loss
73. The cells of excitable and nonexcitable tissues share
a. a resting membrane potential
b. a threshold potential
c. an ability to open the Na$^+$ gates
d. all of these
74. A threshold potential is
a. the peak potential achieved during an action potential
b. the potential achieved when two opposing forces acting upon an ion (concentration and electrical gradients) achieve a state of equilibrium
c. the potential at which K$^+$ permeability increases
d. the point at which there is an explosive increase in Na$^+$ or Ca$^{2+}$ permeability
is affected by which of the following?

71. Which of the following mechanisms help to maintain body temperature on hot days?
a. skin vasodilation
b. decreased muscle tone
c. Sweating
d. all of these
72. The temperature control center within the anterior region of the hypothalamus is activated by and initiates reflexes that mediate
a. warmth; heat loss
b. warmth; heat production and heat conservation
c. cold; heat production and heat conservation
d. cold; heat loss
73. The cells of excitable and nonexcitable tissues share
a. a resting membrane potential
b. a threshold potential
c. an ability to open the Na^+ gates
d. all of these
74. A threshold potential is
a. the peak potential achieved during an action potential
b. the potential achieved when two opposing forces acting upon an ion (concentration and electrical gradients) achieve a state of equilibrium
c. the potential at which K^+ permeability increases
d. the point at which there is an explosive increase in Na^+ or Ca^2+ permeability
is affected by which of the following?

Added by William J.

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