Which of the following cells is part of the body's second line of defense?
a) Mucous cells
b) Germ cells
c) B and T Lymphocytes
d) Natural killer cells
e) None of these choices
d
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Which of the following statements describes how muscles help maintain homeostasis?
A) The contractions of skeletal muscles pull on tendons and move elements of the skeleton. B) Skeletal muscles are responsible for guarding the openings of the digestive and urinary tracts. C) Skeletal muscles are responsible for the pumping action of the heart. D) Skeletal muscles support the weight of some internal organs. E) Skeletal muscle contractions help maintain body temperature.
Transduction requires the transmission of bacterial DNA by a ________________________________________
Fill in the blank(s) with correct word
You are walking barefoot and step on a tack with your right foot. All of the following will occur EXCEPT
A) flexor muscles in your right thigh and leg contract to remove your foot B) reciprocal innervation inhibits extensor muscles in the same limb C) collaterals of sensory neurons stimulate alpha motor neurons that cause extension in the opposite limb D) collaterals of interneurons stimulate a crossed extensor reflex
Madeline likely injured her ulnar nerve. What diagnostic test would best help determine the potential damage to this nerve?
a. Have Madeline extend her elbow against resistance. b. Have Madeline flex her wrist and fingers against resistance. c. Have Madeline hold a piece of paper between her fingers while the physician tries to pull the paper away. d. Have Madeline flex her elbow while the physician applies gentle pressure to the anterior forearm muscles.