Which of the following inhibits unwanted muscle contractions?
A. Motor association (premotor) area
B. Basal nuclei
C. Primary motor cortex
D. Spinocortical tract
E. Cerebellar cortex
B. Basal nuclei
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The C-shaped cartilages that form the lateral and anterior sides of the trachea
A. are called the thyroid cartilages. B. make up the vocal cords. C. consist of ligamentous membranes and smooth muscle. D. function to protect the trachea and maintain an open air passage. E. give rise to the structure known as the Adam's apple in men.
Insulin is secreted from the pancreatic islets of Langerhans in response to elevated levels of glucose in the blood plasma. The effect of insulin is to stimulate cells to take up glucose (out of the plasma), resulting in decreased plasma glucose levels. This system is an example of the physiological principle of
a. homeostasis. b. homeothermy. c. home remedy. d. homeopathy. e. digestion.
Hemophilia A is
A. passed from affected males to their sons. B. more common in females. C. a defect in the clotting mechanism. D. due to an X-linked dominant gene.
After shedding the zona pellucida, the outermost cells of the blastocyst differentiate to form the __________
Fill in the blank with the correct word.