Mammals Are Thought to Have Evolved from

question 24

Multiple Choice

Mammals are thought to have evolved from

• A)thecodonts.
• B)therapsids.
• C)dinosaurs.
• D)marsupials.

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Definitions:

Mesobrain

Another term for the midbrain, which is a portion of the brainstem involved in vision, hearing, motor control, sleep/wake, arousal, and temperature regulation.

Somatic Nervous System

Part of the peripheral nervous system that handles voluntary control of body movements through control of skeletal muscles.

Autonomic Nervous System

The part of the nervous system responsible for control of the bodily functions not consciously directed, such as breathing, the heartbeat, and digestive processes.

Parasympathetic Nervous System

A branch of the autonomic nervous system responsible for conserving energy and promoting 'rest and digest' functions.