According to the most current model of the plasma membrane,

A. the membrane is a rigid unchanging structure.
B. cholesterol forms the innermost layer of the membrane.
C. phospholipids and cholesterol form a single lipid bilayer.
D. proteins are free to move about within a double layer of phospholipids.
E. the membrane is impermeable to all other molecules.


D

Anatomy & Physiology

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Cardiac muscle cells have several similarities with skeletal muscle cells. Which of the following is not a similarity?

A. The cells are each innervated by a nerve ending. B. The cells store calcium ions in the sarcoplasmic reticulum. C. The cells contain sarcomeres. D. The cells become depolarized when sodium ions enter the cytoplasm.

Anatomy & Physiology

Once cells in the SA node reach threshold,

A) a heart attack occurs. B) the heart stops beating. C) nothing happens until the AV node is innervated. D) an action potential is triggered.

Anatomy & Physiology

Blood does not enter or leave the ventricles during the period called

A. ejection. B. rapid filling. C. atrial systole. D. isovolumetric contraction. E. active and passive filling.

Anatomy & Physiology