Which of the following statements concerning the permeability of a typical neuron membrane at rest is TRUE?
A. All of the K+ channels in the membrane are open.
B. The permeability to Na+ is much greater than the permeability to K+.
C. The voltage-gated Na+ channels are in the inactivated state.
D. There is equal permeability to Na+ and K+.
E. Most of the voltage-gated Na+ channels are in the closed state.
Answer: E
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Suppose that epiphyseal lines appear in a 10-year-old's long bones. Which of the following statements is, therefore, true?
A) The epiphyseal plates have ossified and further growth in length is not possible. B) Administration of growth hormone will stimulate future bone growth in length. C) Osteoclasts will dissolve the metaphysis so length growth can continue until adulthood. D) More growth will occur during the teenage years as sex hormones stimulate rebuilding of growth plates. E) Intramembranous ossification will enable further growth in length.
Primary bronchi are to ________ as secondary bronchi are to ________
A) main bronchi; lobar bronchi B) lobar bronchi; segmental bronchi C) segmental bronchi; lobar bronchi D) trachea; pharynx E) lobar bronchi; alveolar ducts
The response of the body to decreasing blood pressure will NOT cause which of the following?
a) Dehydration b) Formation of angiotensin II c) Stimulate the kidneys to secrete rennin d) Formation of ADH e) Increased vasoconstriction
During exercise, sweating helps lose heat from the body through the process of _________.
A) evaporation. B) conduction. C) radiation. D) convection. E) concentration.