Which of the following statements regarding the sliding filament model is false?
A. The A band remains constant in length.
B. Actin and myosin do not shorten during contraction.
C. The sarcomere shortens.
D. Both actin and myosin myofilaments shorten during contraction.
E. The I band and H zones become narrower during contraction.
Answer: D
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The aorta receives the full force of blood exiting the heart during ventricular systole. Which of the following statements best describes the adaptive anatomy of the aorta?
A) Smooth muscle is relatively thin in the aorta to increase lumen size and systemic blood flow. B) Elastic fibers are extensive in the tunica media of the aorta and dampen the pulse pressure generated by the heart. C) The aorta's tunica media is thick with dense regular connective tissue to withstand the blood's pressure. D) The tunica external of the aorta is nearly absent compared to other vessels.
The glomerular capillary blood pressure is higher than capillary pressure elsewhere in the body, primarily because the afferent arteriole has a larger diameter than the efferent arteriole
Indicate whether the statement is true or false
In the amylase activity experiment, Benedict's solution tests for the presence of
A. starch. B. maltose. C. triglycerides. D. protein. E. amino acids.
Most muscles that move the thigh attach proximally to the
A. linea alba. B. sacral spine. C. iliotibial tract. D. os coxae. E. head of the femur.