Which of the following best describes the Vasalva maneuver?
A. It increases pressure in the abdominal cavity and helps to expel abdominal contents.
B. It protects the lungs from overinflation.
C. It prevents food and drink from entering the trachea.
D. It is used to dislodge foreign matter from the airway.
E. It prevents food and drink from entering the nasal cavity.
Answer: A
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Within the medulla oblongata, heart rate and force of contraction are regulated in the
A) cardiac centers. B) decussation of the pyramids. C) ascending tracts of white matter. D) olivary nuclei. E) nucleus cuneatus.
Osteocytes, despite their boney confinement, influence ongoing bone formation by secreting what paracrine?
a. calcitonin b. sclerostin c. vasopressin d. osteoprotegerin e. RANK ligand
The last portion of the small intestine is the ________
A) None of the listed responses is correct. B) duodenum C) jejunum D) ileum
Helper T cells do not ________.
A. secrete inflammatory chemicals. B. secrete cytokines that stimulate clonal selection of B cells. C. secrete cytokines that stimulate clonal selection of cytotoxic T cells. D. secrete fever-producing chemicals. E. secrete cytokines that stimulate macrophage activity.