As a result of the long refractory period in the cardiac action potential, cardiac muscle cannot exhibit
A) tonus.
B) treppe.
C) tetany.
D) recruitment.
E) fatigue.
C
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You are a synthetic chemist and have created a compound that appears to bind to acetylcholine receptors. When applied to the inside of the right atrium, what will the affect be?
A. Decreased force of atrial contraction B. No effects on heart function C. Decreased heart rate D. Increased force of atrial contraction E. Increased heart rate
The reduction of friction between the parietal and visceral surfaces of an internal cavity is the function of
A) cutaneous membranes. B) mucous membranes. C) serous membranes. D) synovial membranes. E) the lamina propria.
Identify the cranial nerves that carry gustatory information
A) trigeminal, facial, and accessory nerves B) facial, glossopharyngeal, and vagus nerves C) glossopharyngeal, trigeminal, and abducens nerves D) hypoglossal, glossopharyngeal, and accessory nerves E) hypoglossal, olfactory, and trochlear nerves
Most transmembrane proteins have ________ regions facing the intra- and extracellular fluid, and ________ regions embedded in the phospholipid bilayer
A) hydrophobic; hydrophilic B) lipophilic; lipophobic C) hydrophilic; hydrophilic D) hydrophobic; hydrophobic E) hydrophilic; hydrophobic