Biology 273-01 Test:03 Spring 2018 1. The capacity of a muscle cell to shorten f
ID: 3518886 • Letter: B
Question
Biology 273-01 Test:03 Spring 2018 1. The capacity of a muscle cell to shorten forcefully is known.as e contractility excitability extensibility. c elasticity. L0 flexibility 2. Muscles exhibit the property of excitability. This means that the muscle C shortens its length. recoils to its original resting length stretches beyond its normal length. p responds to stimulation by the nervous system c excites itself 3. Which of the following is true? Skeletal muscle is capable of spontancous contraction Smooth muscle is found in the walls of hollow organs. Cardiac muscle cells have multiple nuclei. r c Smooth muscle cells are long and cylindrical. There is a small amount of smooth muscle in the heart. 4... Which type of muscle tissue possesses striations? skeletal muscle smooth muscle e cardiac muscle c both skeletul and cardiac muscle both cardiac and smooth muscle e is a bundle of reticular fibers is surrounded by peritaysium r is only found in smooth muscle. 5. A fasciculusExplanation / Answer
1. a) The capacity of a muscle cell to shorten forcefully is known as contractility. Contractility is defined as the inherent power and vigour of the heart's contraction during systole.
2. Muscles exhibit the property of excitability. This means the muscle responds to stimulation by the nervous system. We can define Excitability as the Characteristics of a cell that enables it to react to irritation or stimulation, such as the ability of a nerve or muscle cell to react to an electric stimulus
3. b)Smooth muscle fibres are located in walls of hollow visceral organs, except the heart, appear spindle-shaped, and are also under involuntary control.
4. Skeletal muscle fibres possess striations and under the control of the somatic nervous system, they are attached to bones by bundles of collagen fibres known as tendons.
5. A .faciculus is surrounded by perimysium which is a type of connective tissue specialized muscle fibres in the heart that transmit electrical impulses from the atrioventricular node to the Purkinje fibres are fascicles, also referred to as bundle branches.
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