Human Physiology Quiz

Regulation by Hormone

• Regulation by hormone is not characterized by being accurate in action.

Homeostasis

• Homeostasis refers to the existence of a stable internal environment.

Skeletal Muscle Contraction

• During the contraction of a skeletal muscle fiber, the I band of the sarcomere decreases in length.

Excitation-Contraction Coupling

• The basic substance of excitation-contraction coupling is Ca2+.

Resting Potential of a Myelinated Nerve Fiber

• The resting potential of a myelinated nerve fiber is primarily dependent on the concentration gradient of K+ ions.

Diffusion

• Diffusion depends upon the random motion of molecules.
• Diffusion results in net movement of molecules from regions of high concentration to regions of low concentration.

Heart Sounds

• The second heart sound is associated with the closing of the aortic valve.
• The second heart sound is also associated with the closing of the semilunar valves.

This quiz covers key concepts in human physiology, including hormone regulation and homeostasis. Test your knowledge of physiological processes and mechanisms.