The overall purpose of the countercurrent exchange system is to ________.
A. remove metabolic wastes from the renal cortex
B. supply nutrients and oxygen to the renal medulla
C. supply nutrients and oxygen to the renal cortex
D. supply salt and urea to the renal medulla
E. remove metabolic wastes from the renal medulla
Answer: D
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The structure labeled 2 in the diagram is a
a) somatic motor neuron. b) parasympathetic preganglionic neuron. c) parasympathetic postganglionic neuron. d) sympathetic preganglionic neuron. e) somatosensory neuron.
When a person is transfused with the wrong blood type,
A. fibrinogen is activated. B. the white cells clot. C. they bleed to death. D. the erythrocytes agglutinate. E. hemorrhaging occurs.
Nociceptors differ from other types of receptors because they ________.
A. have free nerve endings B. are not found in the skin C. do not adapt to stimuli D. do not send action potentials
Most of the energy released from a glucose molecule in glycolysis and the citric acid cycle is in the form of:
a. high-energy electrons b. ATP c. ADP d. both B and C above