Over 90 percent of nervous system pathways decussate. What does "decussate" mean?
A. Branch extensively
B. Carry information to and from the same effector
C. Switch from carrying motor information to carrying sensory information
D. Cross from one side of the body to the other
E. None of the choices is correct.
Answer: D
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Steroid hormones
A) are proteins. B) cannot diffuse through cell membranes. C) bind to receptors in the nucleus of their target cells. D) act on target cells by activating second messenger cascades. E) are transported in the blood dissolved in the plasma.
Mechanisms that do not help regulate blood pressure include ________
A) nervous control that operates via reflex arcs involving baroreceptors, chemoreceptors, and higher brain centers B) chemical controls such as atrial natriuretic peptide C) the dural sinus reflex D) renal regulation via the renin-angiotensin system of vasoconstriction
Answer the following statements true (T) or false (F)
1. The trachea connects the larynx to the primary bronchi. 2. O-shaped rings of cartilage help keep the trachea open even when pressure is applied to it. 3. Complete tracheal obstruction causes death in a matter of minutes. 4. The trachea, primary bronchi, and secondary bronchi all contain cartilage in their walls to help keep them open. 5. The smooth muscle contraction that occurs in an asthma attack most seriously affects the secondary bronchi.
Where is the greatest volume of blood found in the body?
A. Capillaries B. Heart C. Veins D. Arteries E. Pulmonary circuit