What secretory cells of the stomach secrete hydrochloric acid?
A) chief cells
B) parietal cells
C) serous cells
D) mucus neck cells
B
Explanation:
A) Chief cells release pepsinogen.
C) Serous cells do not secrete hydrochloric acid.
D) Mucus neck cells do not secrete hydrochloric acid.
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The lumbar regions are located lateral to the umbilical region.
Answer the following statement true (T) or false (F)
An incompetent aortic semilunar valve would allow blood to backflow from the ________
A) right ventricle to the right atrium B) left ventricle to the left atrium C) aorta to the left ventricle D) aorta to the left atrium E) pulmonary trunk to the left ventricle
Autorhythmicity in the heart is the responsibility of:
A) contractile cells. B) cardiac pacemaker cells. C) smooth muscle cells. D) skeletal muscle cells.
Answer the following statement(s) true (T) or false (F)
1. Extensibility refers to the ability of a muscle to stretch. 2. A dark band formed by parallel thick filaments that partly overlap the thin filaments is known as an H band. 3. The sarcoplasmic reticulum is the smooth endoplasmic reticulum of a muscle fiber. 4. Clinically, dystrophin is the most important noncontractile protein to occur in muscle fibers. 5. A deficiency of acetylcholine receptors leads to muscle paralysis in myasthenia gravis.