35. Which of the following sentences is CORRECT? A. Intercalated disc is absent in smooth muscle and skeletal muscle B. The contraction of smooth muscle cells is slow, but they can remain contracted for long periods C. Cerebellar cortex is composed of outer molecular layer, central layer of Purkinje cells, and granule layer D. Ganglia are ovoid structures containing neuronal cell bodies and glial cells supported by connective tissue

35. Which of the following sentences is CORRECT? A. Intercalated disc is absent in smooth muscle and skeletal muscle B. The contraction of smooth muscle cells is slow, but they can remain contracted for long periods C. Cerebellar cortex is composed of outer molecular layer, central layer of Purkinje cells, and granule layer D. Ganglia are ovoid structures containing neuronal cell bodies and glial cells supported by connective tissue

Fundamentals of Sectional Anatomy: An Imaging Approach

2nd Edition

ISBN:9781133960867

Author:Denise L. Lazo

Publisher:Denise L. Lazo

Chapter4: Neck

Section: Chapter Questions

Problem 7RQ

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Which arrangement best describes a bipennate muscle? The muscle fibers feed in on an angle to a long tendon from both sides. The muscle fibers feed in on an angle to a long tendon horn all directions. The muscle fibers feed in on an angle to a long tendon horn one side. The muscle fibers on one side of a tendon feed into it at a certain angle and muscle fibers on the other side of the tendon feed into it at the opposite angle.
Every skeletal muscle fiber is supplied by a motor neuron at the NMJ. Watch this video (http://openstaxcollege.org/l/skelmuscfiber) to learn more about what happens at the neuromuscular junction. (a) What is the definition of a motor unit? (b) What is the structural and functional difference between a large motor unit and a small motor unit? Can you give an example of each? (c) Why is the neurotransmitter acetylcholine degraded after binding to its receptor?
Which of the following statements describes smooth muscle cells? They are resistant to fatigue. They have a rapid onset of contractions. They cannot exhibit tetanus. They primarily use anaerobic metabolism.
35. Which of the following sentences is CORRECT? A. Intercalated disc is absent in smooth muscle and skeletal muscle B. The contraction of smooth muscle cells is slow. but they can remain contracted for long periods C. Cerebellar cortex is composed of outer molecular layer, central layer of Purkinje cells, and gramule layer D. Ganglia are ovoid structures containing neuronal cell bodies and glial cells supported by connective tissue E. All of the above
9. Which of the following correctly describes the end plate potential (EPP)? A)It is primarily mediated by Na+ influx B)It is both a local potential in the end plate area of the muscle cell that allows the muscle cell to depolarize and it is primarily mediated by Na+ influx C)It is both a local potential in the alpha motor neuron that allows a cell to depolarize and it is primarily mediated by Na+ influx D)It is a local potential in the end plate area of the muscle cell that allows the muscle cell to depolarize E)It is a local potential in the alpha motor neuron that allows the muscle cell to depolarize
4. A motor neuron, plus the muscle fibers to which it attaches, constitutes a functional unit called a _____. A. motor unit B. myograph C. syncytium D. treppe
7. Describe the process of muscle contraction from nerve impulse (start) to relaxation (end).
2. As lactic acid and other substances accumulate in an active muscle, they stimulate pain receptors, and the muscle may feel sore. How might the application of heat or substances that dilate blood vessels help relieve such soreness? HINT Think of what is carried to and away from muscles by blood.
1. What are an afferent neuron and efferent neuron? What are efferent components of the facial nerve and their actions? 2. Under certain circumstances, axons in the peripheral nervous system can regenerate after sustaining damage. Why is axonal regeneration in the central nervous system much less likely? 3. At a healthy myoneural junction, acetylcholine is responsible for stimulating muscle activity. What mechanisms are in place to prevent the continuous stimulation of a muscle fiber after the neurotransmitter is released from the presynaptic membrane?
How is muscle contraction stopped? Which of the following is/are correct? A) The brain stops sending the nerve impulse that commands the muscle to contract, interrupting communication at the neuromuscular junction B) Acetylcholineesterase (AChE) is released into the synaptic cleft to destroy any remaining Acetylcholine C) No mechanism is necessary. When the antagonist begins to contract, it forces relaxation and stretch of the agonist muscle. D) Relaxation occurs as the myosin heads are "snapped" off of the thick filaments. This interrupts the crossbridge and allows for muscles to stretch E) Relaxation only occurs if the brain sends a "stop" signal to the muscle
Which of the following step(s) about the excitation of skeletal muscle is/are incorrect? 1. Acetylcholine is released and binds to motor end plate receptors 2. An action potential is created and moves down T-tubules 3. Calcium is released from the sarcoplasmic reticulum 4. Calcium ions bind to tropomyosin to shift troponin off the binding sites for cross-bridging 5. Myosin forms cross-bridges and binds with actin to pull it towards middle of sarcomere
1. During skeletal muscle contraction, what event directly precedes the release of actin by myosin? a. ATP binding b. ATP hydrolysis c. Power stroke d. Release of ADP e. Release of Pi 2. What is the trigger for CICR in skeletal muscle cells? a. Acetylcholine binding b. Activation of nicotinic receptors c. Ca++ entering the cells via VOC channels d. Ca++ release by the sarcoplasmic reticulum e. Movement of troponin out of the groove of actin For questions 12-14, please choose the best answer from the following list. Each answer may be used once, more than once or not at all. Each question has only one best answer. a. Muscle spindle apparatus b. Sarcolemma c. Sarcoplasmic reticulum d. Terminal cisternae e. T-Tubules 3. Primary site of intracellular Ca++ release 4. Maintain optimal overlap of actin and myosin in a resting skeletal muscle cell 5. Aids membrane depolarization along the entire length of the muscle fiber 6. Ion movement responsible for depolarization of the sarcolemma a.…