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In: Biology

5. What is the functiion of the sarcoplasmic reticulum in muscle cell contraction? 6. Explain why...

5. What is the functiion of the sarcoplasmic reticulum in muscle cell contraction?

6. Explain why calcium ions and ACh are vitals for muscle contraction.

7. What is a motor unit? Why does a rapid series of muscle twitches yield a stronger overall contraction than a single twitch?

8. What are the structural and functional differences between slow and fast muscle?

9. The__________and__________systems work together to move the body and specific body parts.

10. The 3 types of muscle tissue are:

11. Muscle fibers shorten when__________slides over__________

a. myosin, actin b. actin, myosin c. myoglobin, actin d. myosin, sarcomeres

12. The__________is the basic unit of muscle contraction.

a. myofibril b. sarcomere c. muscle fiber d. myosin filament

13. Skeletal muscle contraction requires__________

a. calcium ions b. ATP c. arrival of a nerve impulse d. all of the above

14. Nerve impulses first stimulate a skeletal muscle fiber at___________

a. T tubules b. sarcomeres c. neuromuscular junctions d. actin binding sites

15. Mention the muscles located in:

  • Torax
  • Abdomen
  • Arms
  • Legs
  • Back
  • Gluteus

Solutions

Expert Solution

QUESTION 9 -

ANSWER-  the ​​​​​​muscular system and skeletal system work together to move the body and specific body parts.

QUESTION 10-

ANSWER - answer of this question is given below

QUESTION 11-

ANSWER - (b) muscle fibers shorten when actin slides over myosin.

EXPLANATION - Sliding filament theory states that contraction of muscle fibre takes place by the sliding of actin filament over the myosin filament.

Question 12-

ANSWER -the (b) SARCOMERE is the basic unit of muscle contraction .

EXPLANATION -

Question - 13

ANSWER - (d) all of the above

Explanation - for the contraction of skeletal muscle all these factors are required - calcium ions, ATP, arriving of nerve impulse.

Question 14-

ANSWER- nerve impulses first stimulate a skeletal muscle fibre at (C) NEUROMUSCULAR JUNCTION

EXPLANATION -

  • A junction between a motor neuron and sarcolemma of muscle fibre is called neuromuscular junction.
  • Nerve Impulses first stimulate muscle fibre at here.

Below diagram give best explanation for question 11,12,13 and 14

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gladiator answered 1 year ago
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