In a mixed nerve
A. some axons transmit sensory information and others transmit motor information.
B. individual axons transmit both sensory and motor information.
C. chemical synapses occur along with electrical synapses.
D. astrocytes are interspersed with ependymal cells.
A
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Which of the following statements is true regarding the yolk sac in human embryos?
A. It gives rise to the digestive tract. B. It is the source of the first blood cells. C. It allows for gas exchange. D. It allows for the passage of waste. E. It is the major source of nutrients for the embryo.
When calcium ion binds to troponin,
A) tropomyosin rolls away from the active site. B) active sites on the myosin are exposed. C) actin heads will bind to myosin. D) muscle relaxation occurs. E) myosin shortens.
The axial skeleton contains ________. 1. skull 2. scapula 3. true and false ribs 4. vertebrae 5. phalanges
A) 1, 3, 4, 5 B) 1, 3, 4 C) 2, 5 D) 2, 3, 4, 5 E) 1, 2, 3, 5
Which of the following is true of immediate hypersensitivities?
A) They are also called type IV hypersensitivities. B) They are are adaptive immune responses to disease organisms. C) They include allergic contact dermatitis. D) They involve IgE antibodies and the release of histamine from mast cells and basophils.