Migraine results from
A. a neurotransmitter deficiency.
B. release of calcitonin gene-related peptide from the trigeminal nerves at the base of the brain, in response to a spreading wave of excitation followed by lack of response from the cortex.
C. release of an abnormal form of beta endorphin from the trigeminal nerves at the base of the brain, in response to cortical stimulation.
D. not eating enough chocolate, which causes a spreading effect in the cortex.
Answer: B
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Which of the following is FALSE regarding single-unit smooth muscle cells?
A. They have many gap junctions between cells. B. They may have pacemaker activity. C. They have an individual neuron innervating each individual smooth-muscle cell. D. They exhibit tone. E. They may respond to stretch by contracting.
What two muscles are the principle lateral rotators of the arm?
A. Coracobrachialis and pectoralis B. Teres minor and infraspinatus C. Subscapularis and infraspinatus D. Deltoid and supraspinatus
How much of the extracellular fluid comes from blood plasma?
A. 20% B. 33% C. 50% D. 92%
Hair is produced by epithelial cells located in the
A. dermis. B. epidermis. C. hypodermis. D. dermis and hypodermis.