Which skeletal muscles are contracted during
(a) restful inhalation?
(b) inspiratory reserve?
(c) restful exhalation?
(d) forced exhalation?
(a) restful inhalation? Primarily the diaphragm.
(b) inspiratory reserve? Primarily the diaphragm and external intercostal muscles.
(c) restful exhalation? None.
(d) forced exhalation? Primarily the internal intercostals and abdominals.
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In which of the following vessels or chambers is blood relatively high in oxygen?
a. pulmonary artery b. right atrium c. inferior vena cava d. right ventricle e. pulmonary vein
A hydrogen bond is a(n)
a. sharing of a pair of electrons between a hydrogen and an oxygen nucleus. b. sharing of a pair of electrons between a hydrogen nucleus and either an oxygen or a nitrogen nucleus. c. attractive force between a hydrogen atom and either an oxygen or a nitrogen atom that are in other molecules or within the same molecule. d. covalent bond between two hydrogen atoms. e. covalent bond between a hydrogen atom and either an oxygen atom or a nitrogen atom.
Natalie is lethargic, has poor tolerance to cold, and the amount of thyroid hormone in her body is low even though the level of TSH is high. Natalie has a goiter. Which of these diagnoses is the most likely for Natalie's condition?
A) defective thyroid hormone receptors in the body cells B) insufficient iodine in the diet C) defective receptors for thyroid hormone control by the anterior pituitary D) too much iodine in the diet
How do naked viruses differ from enveloped viruses in their attachment/penetration phase?
a. They uncoat after they enter the cell. b. Their DNA attaches to receptors on the cell surface. c. Their protein coat fuses to the cell membrane. d. Their nucleic acids are injected into the cell.