Which situation describes a feedforward mechanism?
A. A drop in core body temperature triggers shivering.
B. An increase in core body temperature stimulates sweating.
C. The smell of rotten food on a plate triggers the vomit reflex.
D. Food in the stomach triggers the production of stomach acid.
E. Blood glucose returns toward normal an hour after a meal.
Answer: C
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The patient has a stroke and has weakness on his right side. How will the weakness affect his ability to swallow?
What will be an ideal response?
Answer the following statements true (T) or false (F)
1. In an asthma attack, medication is inhaled to relax the constricted muscles of the bronchioles. 2. The smallest and last part of the air distribution system of the respiratory tract is the alveolar ducts. 3. Surfactant is needed in the lung to increase the surface tension in the alveoli. 4. Premature infants may not make sufficient surfactant in the lung. This may increase the probability that the alveoli in the lungs will collapse. 5.
What is the role of reticular cells in the bone marrow?
A. They destroy malformed blood cells. B. They secrete colony-stimulating factors. C. They produce antibodies. D. They produce thymosin. E. They give rise to all formed elements of the blood.
Explain the role of major histocompatibility complex (MHC) molecules in T cell activation
What will be an ideal response?