The superior-inferior dimension of the thoracic cavity increases due to contraction of the _______.
a. diaphragm
b. sternocleidomastoid
c. rectus abdominis
d. internal intercostals
e. transverse abdominis
Answer: a. diaphragm
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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.
The nurse is preparing to admit a 3-year-old child with acute spasmodic laryngitis. What clinical features of hepatitis B should the nurse recognize? (Select all that apply.)
ANS: B, C, E Clinical features of acute spasmodic laryngitis include a croupy cough, a tendency to recur, and occurring sudden, often at night. High fever is a feature of acute epiglottitis and purulent secretions are seen with acute tracheitis.
A "benign tumor" refers to
A) any of various malignant neoplasms. B) neoplasms that have the tendency to metastasize to new sites. C) an illness characterized by malignant cells. D) abnormal cells remaining in one place. E) nonviable cells and/or tissue.
Pinocytosis is a form of
a. active transport. b. cytokinesis. c. endocytosis. d. exocytosis. e. hemolysis.