Choose the correct statement regarding sensory receptors.
A. Our senses can perceive a wide range of energies.
B. Different modalities of sensations have different types of impulses.
C. The brain cannot distinguish between impulses of cold and heat.
D. Sensory receptors transduce different forms of physical energy to nerve impulses.
Answer: D
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When the mitral valve closes, it prevents the backflow of blood from the
a. left atrium into the left ventricle. b. left ventricle into the left atrium. c. right atrium into the right ventricle. d. left ventricle into the aorta. e. right ventricle into the pulmonary trunk.
Motor neurons are sometimes inhibited by
A) muscle spindle organs. B) joint receptors. C) Golgi tendon organs.
Blood flowing out of the pulmonary veins flows into the ________ and then proceeds through the ________.
A. pulmonary trunk; right ventricle B. left ventricle; aortic semilunar valve C. left atrium; mitral valve D. right atrium; tricuspid valve E. right ventricle; pulmonary trunk
A 27-year-old woman comes to the hospital in the early stages of labor. She is 37 weeks pregnant in her first pregnancy, which has been normal. She has no notable past medical history, does not smoke or drink, and is not taking any medications. The examination in the labor and delivery unit is normal, and all appears well with the fetus. At this time, which of the following fetal vessels is carrying the highest concentration of oxygen?
(A) Abdominal aorta (B) Umbilical arteries (C) Pulmonary artery (D) Umbilical vein (E) Pulmonary veins