The Two Major Divisions of the Nervous System Are the ____

question 47

Multiple Choice

The two major divisions of the nervous system are the ____.

• A) brain and spinal cord
• B) central and somatic nervous systems
• C) sympathetic and parasympathetic systems
• D) peripheral and central nervous systems

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Definitions:

Blood Islands

Clusters of developing blood cells and vessels found in the embryonic yolk sac.

Sinus Venosus

End of the embryonic cardiac tube where blood enters the heart; becomes a portion of the right atrium, including the SA node.

Pharynx

Upper expanded portion of the digestive tube between the esophagus below and the oral and nasal cavities above and in front.

Thyroid Gland

Endocrine gland located inferior to the larynx and consisting of two lobes connected by the isthmus; secretes the thyroid hormones triiodothyronine (T3) and tetraiodothyronine (T4).