The Lipoproteins LDL and HDL Are Thought to Influence Heart

question 10

Multiple Choice

The lipoproteins LDL and HDL are thought to influence heart disease risk because:

• A) LDL are much lighter in weight since they do not contain as much cholesterol to take to the cells.
• B) HDL are affected by the amount of cholesterol we eat in our diet.
• C) LDL benefit the heart by transporting cholesterol to the tissues and away from blood.
• D) HDL play an important role in scavenging cholesterol from the tissues for disposal.

---

Definitions:

Action Potential

A brief electrical impulse that a neuron uses to transmit information along its axon, essentially an on-off signal.

Axon

A narrow, elongated extension of a neuron that usually transmits electrical signals from the cell body of the nerve cell.

Refractory Period

The period immediately following the transmission of a nerve impulse or the contraction of a muscle during which a nerve or muscle is unresponsive to further stimulation.

Threshold

The point or level at which something begins or changes.