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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A metacarpophalangeal joint is classified as which of the following?
A. A pivot joint B. A ball and socket joint C. A gliding joint D. A hinge joint E. A condylar joint
The collecting duct is naturally impermeable to salt but permeable to water.
Answer the following statement true (T) or false (F)
The oxygenated form of hemoglobin is called
A. oxyhemoglobin. B. deoxyhemoglobin. C. carboxyhemoglobin. D. carbaminohemoglobin. E. loaded hemoglobin.
Platelets ______, because of their being exposed to ______.
A) Stick to the damaged area of a blood vessel and help seal the break, plasma B) Stick to the damaged area of a blood vessel and help seal the break, smooth muscle C) Stick to the damaged area of a blood vessel and help seal the break, collagen in the basement membrane D) None of the above