Although the Placenta Acts as a Filter for Many Harmful

question 68

Multiple Choice

Although the placenta acts as a filter for many harmful substances, some are able to pass from mother to embryo. They include

• A) alcohol.
• B) toxins in cigarette smoke.
• C) caffeine.
• D) drugs.
• E) all of these.

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Definitions:

Axons

Long, threadlike parts of nerve cells along which impulses are conducted from the cell body to other cells.

Propagating Action Potential

The process by which an electrical impulse travels along the length of a neuron, enabling communication within the nervous system.

Myelin

A fatty substance that surrounds and insulates nerve fibers, increasing the speed at which electrical impulses are conducted.

Conduction Speed

The rate at which an electrical impulse travels along a nerve or muscle fiber.