What is the action of all of the negative feedback mechanisms of the body?
What will be an ideal response?
Answer: They prevent sudden severe changes within the body.
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Which of the following monitors the composition of the cerebrospinal fluid?
A) sensory neurons on the surface of the medulla oblongata B) sensory neurons found in the carotid bodies C) sensory neurons found in the aortic bodies D) sensory neurons in the walls of the right atrium E) sensory neurons in the walls of the carotid sinus
The first event in muscle fiber contraction is that
A) the muscle fiber membrane is stimulated and a muscle impulse travels deep into the fiber through transverse tubules. B) acetylcholine diffuses across a gap at a neuromuscular junction. C) calcium ions diffuse from sarcoplasmic reticulum into the sarcoplasm and bind to troponin molecules. D) acetylcholine is released from the end of the motor neuron.
Given that impulses from parasympathetic nerves decrease heart rate, and that the neurotransmitter for parasympathetic postganglionic fibers is acetylcholine (ACh), predict how the following chemicals might affect heart rate
A) Pilocarpine, a drug that simulates the action of ACh, will increase heart rate; and atropine, a drug that blocks the action of ACh, will decrease heart rate. B) Pilocarpine, a drug that simulates the action of ACh, will decrease heart rate. C) Atropine, a drug that blocks the action of ACh, will decrease heart rate. D) Pilocarpine, a drug that simulates the action of ACh, will increase heart rate.
The MOST effective method for decreasing morbidity and mortality associated with spinal cord injury is:
A) rapid transportation to a trauma center. B) public education and prevention strategies. C) minimizing scene time to 10 minutes or less. D) routine use of spinal motion restriction precautions.