Which of the following statements about the endocrine system is NOT true?
A. Some neurons secrete hormones.
B. Both the nervous and endocrine systems respond quickly and are active for a long time.
C. The hypothalamus is important to both the nervous and endocrine systems.
D. Both the nervous and endocrine systems may utilize the same chemical molecule.
Answer: B
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Tetanic muscle contractions don't occur in a normal cardiac muscle because
A) cardiac muscle tissue contracts on its own. B) neural stimulation is lacking. C) the refractory period lasts until the muscle relaxes. D) the refractory period ends before the muscle reaches peak tension. E) potassium channels outnumber sodium channels.
A condition characterized by excessive development of mammary glands in a male is called
a) acromegaly. b) pheochromocytoma. c) hirsutism. d) gynecomastia. e) myxedema.
There are this many vertebrae in the cervical region?
A. 5 B. 6 C. 7 D. 8
Which of the following is an incorrect statement regarding the occurrence of a sensation?
A) A generator potential in the associated sensory neuron must reach threshold. B) The stimulus energy must be converted into the energy of a graded potential called a transduction potential. C) The stimulus energy must match the specificity of the receptor. D) The stimulus energy must occur within the receptor's receptive field.