Infants Can See Objects Before They Can Control Their Torso

question 50

Multiple Choice

Infants can see objects before they can control their torso, and they can use their hands long before they can crawl or walk. This would indicate that they have a ________ pattern of growth.

• A) proximodistal
• B) proximocaudal
• C) cephalodistal
• D) cephalocaudal

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Definitions:

All-Or-None Contraction

A principle stating that a nerve or muscle fiber responds completely or not at all to a stimulus once the stimulus reaches a threshold value.

Muscle Fiber

A single, elongated muscle cell that can contract in response to stimulation.

Motor Unit

Single neuron and the muscle fibers it innervates.

Cholinesterase

An enzyme that breaks down acetylcholine and other choline esters in the nervous system to terminate synaptic transmission.