Explain the feedback mechanism involved in true labor. Indicate the components of the feedback system (for example, identify the control center), their responses to stimuli, and the nature of the response (is it positive or negative feedback?)
What will be an ideal response?
Labor involves a positive feedback cycle. Oxytocin release stimulates prostaglandin release and uterine contraction. Contractions cause increased pressure against the cervix. Cervical stretch stimulates the hypothalamus (control center) to secrete more oxytocin and the cycle repeats and is amplified.
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Which of the following is true regarding lactose intolerance?
A) The stomach produces inadequate amounts of lactase. B) Lactose-intolerant infants cannot digest dairy fat and are at risk of starvation. C) The person cannot digest any type of monosaccharide. D) The intestinal crypts are not producing the enzyme lactase. E) The enzyme maltase begins to digest lactose.
Anterograde amnesia is the inability to recall recent past events
Indicate whether the statement is true or false
In pigs, the pectoralis group of muscles consists of ________ muscles, while in humans it consists of ________
A) one; three B) two; three C) three; one D) three; two
Vasoconstriction:
A. decreases peripheral resistance B. increases arterial blood pressure C. is caused by relaxation of smooth muscle in the blood vessel walls D. decreases cardiac output