Which vessel is guarded by a semilunar valve at its base?

A) superior vena cava B) pulmonary trunk C) pulmonary vein D) coronary sinus


Answer: B

Anatomy & Physiology

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What attaches epithelial cells to the basement membrane?

A. gap junction B. hemidesmosomes C. adhesion belt D. tight junction E. desmosomes

Anatomy & Physiology

Which of the following events is NOT a characteristic of an action potential?

A. In repolarization, K+ flow out of the cell. B. As Na+ enter, the inside of the plasma membrane becomes more negative. C. The plasma membrane becomes highly permeable to Na+ and depolarization results. D. At the peak of depolarization, Na+ channels begin to close and K+ channels open. E. Action potentials occur according to the all-or-none principle.

Anatomy & Physiology

________ are immature erythrocytes that are present in the circulation

A) Erythroblasts B) Normoblasts C) Myeloblasts D) Band cells E) Reticulocytes

Anatomy & Physiology

Myopia generally occurs when the ________.

A. cornea is uneven B. eyeball is too long C. lens is uneven D. eyeball is too short

Anatomy & Physiology