The intracellular effector in chemical signaling is often
A) a hormone.
B) a membrane receptor molecule.
C) cholesterol.
D) a protein kinase.
E) ATP.
D) a protein kinase.
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In people who stand for long periods, blood tends to pool in the lower limbs, and this may result in varicose veins. What causes the varicose veins?
A. Failure of the lymphatic valves B. An aneurysm or weak point in an artery C. An aneurysm or weak point in a vein D. A ruptured aneurysm in a vein E. Failure of the venous valves
Troponin and tropomyosin are associated with what other protein within the muscle fibers?
A. intermediate filaments B. extra cellular matrix C. microtubules D. actin
Where are the cell bodies of the preganglionic neurons of the sympathetic division of the ANS located?
A. Thoracolumbar region B. Craniosacral regions C. Sympathetic chain ganglia D. Pons and medulla oblongata E. Collateral ganglia
Which structures monitor rotational acceleration of the head?
A) cristae of the semicircular canals B) maculae of the utricle and saccule C) maculae of the utricle only D) maculae of the saccule only