Which of the following is the correct sequence of structures in a reflex arc?
A. Receptor, effector, interneuron, sensory nerve, motor nerve
B. Effector, motor nerve, sensory nerve, interneuron, receptor
C. Receptor, sensory nerve, interneuron, motor nerve, effector
D. Sensory nerve, interneuron, receptor, motor nerve, effector
Answer: C
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The phrenic and intercostal nerves are made up primarily of autonomic nerves for smooth muscle control
Indicate whether this statement is true or false.
A 63-year-old man comes to the emergency department with back pain, weakness, and shortness of breath. On examination, he has an aneurysm of the abdominal aorta at the aortic hiatus of the diaphragm. Which of the following pairs of structures would most likely be compressed?
(A) Vagus nerve and azygos vein (B) Esophagus and vagus nerve (C) Azygos vein and thoracic duct (D) Thoracic duct and vagus nerve (E) Inferior vena cava (IVC) and phrenic nerve
Which is a source of water input?
a. Fluid intake b. Ingested food c. Chemical reactions within the cells that convert food and O2 into energy d. All of the above e. Only a and b
Opening and closing of the heart valves is caused by ________.
A. gravity B. breathing C. valves contracting and relaxing D. osmotic gradients E. pressure gradients