FREE ANATOMY AND STUDY GAMES ABOUT CH 9

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FREE ANATOMY AND STUDY GAMES ABOUT CH 9

MUSCLES/TISSUES EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -92 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation Question 1: An elaborate network of membranes in skeletal muscle cells that functions in

calcium storage is called:

Answer:

The sarcoplasmic reticulum

Question 2: What does the I-band contain?

Answer:

It only contains the actin filaments Question 3: Muscle tissues has all the following properties (Contractability, excitability,

extensibility) EXCEPT:

Answer:

Secretion

Question 4: What is the SARCOLEMMA?

Answer:

the muscle cell membrane.

Question 5: What molecules do calcium ions bind to in skeletal muscle cells?

Answer:

Calcium Ions bond to troponin molecules.Question 6: When a muscle fiber contracts, the I-Bands diminish in size, the H zones disappear, and the A bands move closer together but do not diminish in length. T OR F?

Answer:

True

Question 7: What is muscle tone?

Answer:

A state of sustained partial contraction Question 8: 3 discrete types of muscle fibers are identified based on size, speed, and endurance. wich would best represent the use of red fibers?

Answer:

a Long relaxing swim Question 9: Whereas skeletal muscle cells are electrically coupled, smooth muscle cells appear to be chemically coupled by gap junctions. T OR F?

Answer:

False Question 10: During isotonic contraction, the heavier the load, the faster the velocity of contraction. T OR F?

Answer:

False Question 11: Eccentric contractions are more forceful than concentric contractions. T OR F?

Answer:

True Question 12: What is the site of calcium regulation in the smooth muscle cell called?

Answer:

Calmodulin

Question 13: A motor neuron and all the muscle plates are referred to as a motor end plate. T OR F?

Answer:

False Question 14: What is recruited later in muscle stimulation when contractile strength increases?

Answer:

Motor units with larger, less excitable neurons.

Question 15: What do most muscles contain?

Answer:

A mixture of fiber types.Question 16: What happens to to calcium after nervous stimulation of the muscle cell has ceased?

Answer:

The calcium level in cytoplasm drops.Question 17: What is the phenomenon where the contraction strength of a muscle increases due to increase in Ca2+ availability and enzyme efficiency during the warm up?

Answer:

Treppe Question 18: Recruitment is an option of a single unit smooth muscle cell. T OR F?

Answer:

False

Question 19: What is muscular dystrophy?

Answer:

when muscle fibers degenerate and atrophy.Question 20: The warm-up period required of athletes in order to bring their muscles to peak

performance is called___:

Answer:

TREPPE

Question 21: What is tetanus?

Answer:

Continued sustained smooth contraction due to rapid stimulation Question 22: Although there are no sarcomeres, smooth muscle still possesses thick and thin filaments. T OR F?

Answer:

True

Question 23: Why does Rigor mortis occur?

Answer:

Because there is no ATP available to release attached actin and myosin molecules.

Question 24: Single unit smooth muscle is found in the intestines. T OR F?

Answer:

True Question 25: During Isometric contraction, the energy used appears as movement. T OR F?

Answer:

False

Question 26: what is true about isotonic contraction?

Answer:

Muscle tension remains relatively constant.Question 27: One of the important functions of skeletal muscle contractions is to produce heat.

T OR F?

Answer:

True

Question 28: What is maximal stimulus?

Answer:

The stimulus above which no strongest contraction can be elicited, because all motor units are firing in the muscle.