Which statement is not correct?
a. Normally the effective plasma concentration of a hormone is regulated by appropriate adjustments in the rate of its secretion.
b. In order to maintain homeostasis, the rate of hormone secretion remains constant.
c. All hormones are regulated through negative feedback controls.
d. Neuroendocrine reflexes produce a sudden increase in hormone secretion in response to a specific, usually external, stimulus.
e. Some organs have endocrine and exocrine functions.
B
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Which statement does not apply to macrophages?
a. They participate in inflammation. b. They process and present antigens to lymphocytes. c. They secrete antibodies. d. They secrete interleukin 1. e. They participate in immune surveillance against cancer.
Which reaction releases enzymes such as hyaluronidase and acrosin that allow sperm to penetrate the corona radiata of the secondary oocyte?
A) capacitation B) acrosomal reaction C) cortical reaction D) sperm migration
When analyzing lipase activity in the lab, why did no fat digestion occur in tube 6L (3 ml litmus cream, 3 ml lipase, bile salts, 0 degrees C)?
A) The temperature was too low. B) There was no enzyme present. C) The enzyme and substrate were at the correct temperature. D) The temperature was too high.
The function of the C-rings of hyaline cartilage in the trachea is to keep the airway patent or open for breathing
Indicate whether the statement is true or false