True or False? Vaccinations provide natural-type immunity. Select one:
a. true
b. false
b. false
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During childbirth, as a baby's head is pressed against the mother's cervix, signals are relayed via nerves from cervix to the mother's brain. The brain initiates the secretion of oxytocin (a hormone) from the mother's pituitary gland. Oxytocin stimulates further uterine contractions. As the uterus contracts even harder in response to oxytocin, the baby's head is pushed harder against the cervix; this stimulates yet more nerve signals to the mother's brain, resulting in yet more oxytocin secretion until finally the baby is pushed through the cervix. This process of childbirth is an example of
A. positive feedback. B. acclimatization. C. feedforward regulation. D. negative feedback. E. adaptation.
Which are functions performed by the fibrous skeleton of the heart?
a: Separates the atria and ventricles b: Anchors the heart valves c: Provides electrical insulation between the atria and ventricles d: Provides the framework for the attachment of the myocardium e: None of these are true functions of the fibrous skeleton of the heart A. a, d B. b, d C. a, c, d D. a, b, c, d E. e
Blood plasma without clotting factors is called ____
a. thrombin b. fibrin c. thromboplastin d. serum
The viscera within the pelvis are drained through the ________ vein.
A. external iliac B. internal iliac C. hepatic portal D. inferior mesenteric