Which of the following best classifies the baroreceptor reflex?
A) cranial; autonomic; innate; polysynaptic
B) cranial; somatic; conditioned; polysynaptic
C) cranial; autonomic; conditioned; monosynaptic
D) spinal; autonomic; innate; polysynaptic
E) spinal; autonomic; innate; monosynapti
Answer: A) cranial; autonomic; innate; polysynaptic
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Which of the following processes is NOT part of the communication at a neuromuscular junction? (Select all correct choices.)
A. The neuron releases a neurotransmitter to signal contraction by the muscle cell. B. A cell-surface receptor on the muscle cell is activated by acetylcholine binding. C. Upon activation, the acetylcholine receptor on the neuron undergoes a conformational change to activate an ion channel in the muscle cell. D. An opened ligand-gated ion channel allows sodium ions to rush across the plasma membrane to the inside of the muscle cell. E. A sudden influx of sodium ions across the plasma membrane drastically reduces the membrane potential and activates the contractile machinery of the muscle cell.
Cilia (select all correct choices):
A. are specialized organelles found on some epithelial cells. B. are used by epithelial cells to move substances along cell surfaces. C. are used by sperm cells for motion. D. None of these choices are correct.
Communities of organisms are made up of:
a. populations of different species. b. different habitats. c. two or more populations of the same species. d. ecosystems. e. interacting niches.
Movement of substances that requires the
expenditure of ATP molecules is
a. facilitated diffusion. b. simple diffusion. c. active transport. d. osmosis. e. bulk flow.