Drugs that decrease membrane permeability to sodium
A. increase pain.
B. lessen pain.
C. make pain-signalling neurons more excitable
D. increase the amount of nerve impulses to/through an affected area.
Answer: B
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Which type of innervation causes reduced blood flow to the digestive tract?
A. Parasympathetic B. Sympathetic
Answer the following statements true (T) or false (F)
1. Much of the interstitial fluid that is pushed out of the blood vessels returns to the blood vessels. 2. Both the lymph capillaries and blood capillaries have a layer of endothelium. 3. Both the lymph capillaries and blood capillaries have a layer of tightly fitting squamous epithelium. 4. Unlike blood vessels, lymph vessels have one-way valves to ensure the lymph moves in only one direction. 5. Lymph from about one fourth of the body drains into the thoracic duct.
If the sacrum were to develop without its primary curve, it would be concave.
Answer the following statement true (T) or false (F)
When an action potential reaches the presynaptic terminal,
A. acetylcholine moves into the presynaptic terminal. B. ligand-gated ion channels in the presynaptic terminal are opened. C. nothing else happens. D. a local potential is generated in the presynaptic terminal. E. calcium ions diffuse into the presynaptic terminal through voltage-gated ion channels.