The direct motor pathway originates in the
A. reticular formation of the brainstem.
B. motor cortex of the cerebral cortex.
C. vestibular nuclei of the brainstem.
D. superior colliculus of the midbrain.
Answer: B
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The mechanism of contraction in smooth muscle is different from skeletal muscle in that ________
A) ATP energizes the sliding process B) the site of calcium regulation differs C) the trigger for contraction is a rise in intracellular calcium D) actin and myosin interact by the sliding filament mechanism
Of the three germ layers, the mesoderm forms the most body parts
Indicate whether the statement is true or false
Which of the following is NOT a gland in the endocrine system?
A. Thyroid B. Pituitary C. Hypothalamus D. Salivary
The integumentary system ________
A) is a site for blood-cell formation B) breaks down ingested food C) protects the deep organs from injury and drying out D) contributes to the acid-base balance of the blood