When venous pressure is too low, ________ stimulate smooth muscles in the walls of veins to contract.
A. carbon dioxide levels
B. parasympathetic reflexes
C. somatic reflexes
D. sympathetic reflexes
Answer: D
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A long bone is covered externally with a sheath called the __________, whereas the marrow cavity is lined with the __________.
A. epiphysis; diaphysis B. diaphysis; epiphysis C. compact bone; spongy bone D. periosteum; endosteum E. endosteum; periosteum
Which of the following is not true of triglycerides?
a. A part of the molecule attracts water. b. The molecule contains three fatty acids. c. The molecule contains glycerol. d. Triglycerides are used by the body to store energy.
Which of the following is a type of protein that defends against viral infections?
a. complement b. interleukin c. cytokines d. interferon e. complement and interferon
Describe the H zone of the sarcomere. The H zone:
A. contains both myosin and actin myofilaments B. contains only actin myofilaments C. contains only myosin myofilaments