Exam 7: The Peripheral Nervous System: Efferent Division

The accompanying figure relates to events at the neuromuscular junction. Match the steps highlighted in the figure (steps 1-9) with the statements using the letter key below. -generation of end-plate potential

A drug that blocks Beta 1 receptors would be used to treat asthma.

Drugs that do this would decrease sympathetic function:

The autonomic nervous system is

Nicotinic receptors

The origin of the sympathetic nervous system is in the ____________________ horn of the spinal cord.

Most innervated blood vessels receive sympathetic and parasympathetic fibers.

Compare and contrast the divisions of the autonomic nervous system.

Indicate the proper sequence of events at the neuromuscular junction by filling in the blank with the appropriate number from 2 through 7. Numbers 1 and 8 are already identified. _____ ACh is released from the axon terminal by exocytosis. _____ An EPP takes place, primarily as a result of Na⁺ influx. __8___ Acetylcholinesterase inactivates ACh, terminating activity at the neuromuscular junction. ___1__ An action potential is propagated to an axon terminal of a motor neuron. _____ Channels that permit passage of Na⁺ and K⁺ are opened in the motor end plate. _____ Ca²⁺ channels are opened in the axon terminal. _____ Local current flow between the motor end plate and adjacent muscle-cell membrane initiates an action potential that spreads throughout the muscle fiber. _____ ACh binds with receptor sites on the motor end plate.

Most sympathetic postganglionic fibers have cell bodies in a sympathetic ganglion ____________________.

MATCHING Indicate which part of the autonomic nervous system is being described by writing the appropriate letter in the blank using the following answer code. -Originates in the cranial and sacral regions of the CNS.

Sympathetic and parasympathetic activity at the salivary glands is antagonistic.

MATCHING Indicate which part of the autonomic nervous system is being described by writing the appropriate letter in the blank using the following answer code. -Has a long preganglionic fiber and a short postganglionic fiber.

Sympathetic activity stimulates the secretion of ____________________ from the pancreas.

Indicate whether the following autonomic anatomical and physiological features pertain to: -causes contraction of digestive sphincters

The axons controlling skeletal muscles originate in the frontal lobe.

Which of the following chemicals paralyzes skeletal muscle by binding to the acetylcholine receptor sites?

Which of the following statements concerning the terminal ganglia is correct?

Muscarinic receptors are found on the effector cells innervated by the sympathetic division.

Indicate the characteristics of the types of autonomic receptors using the following answer code (more than one answer may apply): -Bind with acetylcholine released from parasympathetic postganglionic fibers.