Each breath is initiated by neurons in the "respiratory control center" located in the
A. larynx.
B. medulla oblongata.
C. cerebellum.
D. spinal cord.
E. carotid body.
Answer: B
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Rowley Pharmaceutical company produces a drug that promotes new blood vessel growth. Is there any application for this drug in wound treatment?
A. It could be very beneficial-one of the biggest problems with wound infections is their largely anaerobic nature. The blood supply to the area is usually compromised, helping to create the anaerobic environment. Certain pathogenic microbes then thrive in this environment, creating very serious wound infections. B. It could be disastrous! Part of the reason abscesses lack blood flow is to keep toxins and bacteria from spreading to other areas of the body. Increasing blood flow to the area will provide a highway for these bacteria to seed other organ systems! C. It could be dangerous-wounds need to cut off blood supply to prevent the patient from bleeding to death. Increasing blood vessel development in the wound site might cause the patient to bleed out. D. There would be no beneficial effect-the immune response is already in place in the wound site, so increasing blood cell delivery to the area wouldn't increase or decrease the rate of wound healing.
Which of the following diseases is not an autoimmune disease?
a. rheumatoid arthritis b. Graves' disease c. AIDS d. multiple sclerosis
An essential amino acid is one that the body cannot synthesize in sufficient amounts
__________________Indicate whether the statement is true or false.
Blood calcium level is regulated in part by _________ a hormone secreted by the thyroid gland when the blood calcium level rises.
A) serotonin. B) parathyroid. C) calcitonin. D) estrogen.