In: Biology
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:
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 -
Below diagram give best explanation for question 11,12,13 and 14