Question

1. (2 points) If you were given a microscope slide with an unknown type of muscle tissue, what features would you look for to determine whether the tissue was smooth muscle or skeletal muscle? Give 2 characteristics that would allow you to distinguish between these tissue types. Be sure to state which type of muscle has the characteristics you describe.) 2. Give 3 examples of different types of connective tissues found within the body and briefly note one function of each of the tissues you listed. (3 Points) 3. (I poinb) Which of the following shortens during a skeletal muscle contraction? A. The thick filaments B. The thin filaments C. The A band D. The H zone E. All of the above 4. What role do the t-tubules play in muscle contraction? (1 point) A. Block the binding sites on the actin molecule B. Carry the action potential into the muscle fiber C. Stores and release Ca++ D. Stabilize the thick filaments within the sarcomere E. Binds acetylcholine from the motoneurorn 5. During a muscle contraction, calcium is released from intracellular stores in the and binds to which pulls out of the way to expose the binding sites on the(protein that makes up the thin filaments). (4 points) 6. After an individual dies, rigor mortis (a stiffening of the muscles) sets in. In this state the muscles remain contracted and are unable to relax. Based on your knowledge of muscle physiology, what might explain this condition? (1 point) What is the motor unit? (1 point) A. All of the muscle fibers controlled by the same region of the brain B. All of the muscle fibers controlled by the same motor neuron C. All of the muscle fibers that are involved in a muscle contraction D. All of the muscle fibers that have receptors for acetylcholine E. None of the above 7. Which of the following correctly describe the hierarchical organization of a muscle going from to smallest? (1 point) E. Muscle →myofiber--> myofibril--> fascicle s sarcomere F. S Sarcomere-myofibril >myofiber ->muscle->fascicle G. Muscle--> fascicle--> myofiber-> myofibril → sarcomere H. Fascicle - >muscle >myofibril->myofiber sarcomere I. Fascicle-muscle -myofiber >sarcomere->myofibril

Answer 1

Answer:-

1 The qualities that will separate between a smooth muscle and a skeletal muscle are following:

a) Shape-Smooth muscle will be short and axle formed. Skeletal muscle will be long round and hollow molded

b) Nucleus: Smooth muscle will have a solitary core and skeletal muscle will have numerous incidentally found cores.

c) Striation: Smooth muscle won't have any striation yet skeletal muscle will be striated..

2. Three different types of connective tissues are following

a) Loose connective tissue- It includes areolar tissue which connects different parts of the body like skin, muscles, nerves, blood vessels etc. and provide strength elasticity and support to the parts.

b) Dense connective tissue-It incorporates white stringy tissue which because of its less flexibility makes the joints of the bones in the skull relentless.

c) Specialized connective tissue-it incorporates skeletal tissues like bones and makes the hard parts of the body skeleton.

3. The H zone shortens during muscle contraction. H-zone is the region at the middle of the muscle where the thick filaments are not overlapped with the thin filaments. At the point when muscle withdrawal happens the thin fibers from the two sides come nearer to one another and covers the thick fibers and along these lines the H-zone abbreviates.

4. T-tubules carries the action potential into the muscle fibre they have a voltage touchy protein which when enacted enables opening the Ca2+ to discharge diverts in the sarcoplasmic reticulum of the muscle cells and therefore discharging the Ca2+ particles.

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