Skeletal Muscle Physiology Essay

The Muscle Twitch and the Latent Period Lab Report Pre-lab Quiz Results You scored 20 % by replying 1 out of 5 inquiries right. 1. Skeletal musculuss are connected to castanetss by Your reply: c. ligaments. Correct reply: b. sinews. 2. Skeletal musculuss are composed of 100s to 1000s of single cells called Your reply: b. sarcostyles. Correct reply: c. fibres.

3. The term motor unit refers to Your reply: b. all of the activated musculus fibres within one skeletal musculus. Correct reply: c. one motor nerve cell and all of the skeletal musculus fibres it innervates. 4. The motor nerve cell and musculus fibre intersect at what is called You right answered: d. the neuromuscular junction. 5. A vellication is Your reply: c. multiple contractile responses to a series of action potencies. Correct reply: a. one contractile response to a individual action potency.

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Experiment Results Predict Question: Predict Question: Will alter to the stimulus electromotive force alter the continuance of the latent period? Your reply: a. Yes. altering the stimulus electromotive force will alter the latent period continuance proportionally. Stop & A ; Think Questions: What is the period of clip that elapses between the coevals of an action potency and the start of musculus tenseness development in a musculus fibre?

Your reply: d. the recess period Correct reply: c. the latent period What occurs during the latent period of these isometric contractions? Your reply: a. The length of the musculus fibre is skiding into an optimum length. Correct reply: B. All the stairss of excitation-contraction yoke occur. Experiment Data: Voltage 0. 0 3. 0 4. 0 6. 0 8. 0 10. 0 Length 75 75 75 75 75 75 Active Force 0. 00 1. 04 1. 32 1. 65 1. 81 1. 82 Passive Force 0. 00 0. 00 0. 00 0. 00 0. 00 0. 00 Entire Force 0. 00 1. 04 1. 32 1. 65 1. 81 1. 82 Latent Time period

Post-lab Quiz Results You scored 100 % by replying 7 out of 7 inquiries right. 1. An action potency in a motor nerve cell triggers the release of which neurotransmitter? You right answered: b. acetylcholine 2. The term skeletal musculus fibre refers to You right answered: a. an single skeletal musculus cell. 3. The ranked depolarisation in the skeletal musculus fibre that is elicited in response to one action potency from the motor nerve cell is called You right answered: c. an EPP ( end-plate potency ) .

4. Which of the followers is non a stage of a skeletal musculus jerk? You right answered: b. hyperpolarization stage 5. A skeletal musculus vellication is You right answered: a. one contractile response to a individual action potency. 6. Which of the following right matches the vellication stage with its definition? You right answered: d. the contraction stage: the clip between the terminal of the latent period and peak musculus tenseness 7. A sufficiently strong electrical stimulation applied to an isolated. mounted skeletal musculus induces the development of musculus force. or musculus tenseness. Which of the undermentioned statements refering this observation is true? You right answered: c. The electrical stimulation mimics acetylcholine release at a neuromuscular junction

Review Sheet Results 1. Specify the footings skeletal musculus fibre. motor unit. skeletal musculus vellication. electrical stimulation. and latent period. Your reply: Skeletal musculus fibres are normally attached to the skeleton and do voluntary actions such as walking. speaking and standing up possible. A motor unit consists of a motor nerve cell and all of the musculus fibres it innervates. Skeletal Muscle vellication is the mechanical response to a individual action potency. It has three stages known as the latent. contraction. and relaxation stage. Electrical stimulation is used to command musculus contractions. Latent Time period is the period of clip that elapses between the coevals of an action potency in a musculus cell and the start of musculus contraction.

2. What is the function of acetylcholine in a skeletal musculus contraction? Your reply: Acetylcholine diffuses onto the musculus fiber’s plasma membrane and binds to receptors in the motor terminal home base originating a alteration in ion permeableness that consequences in a depolarisation of the musculus plasma membrane. 3. Describe the procedure of excitation-contraction yoke in skeletal musculus fibres. Your reply: The events that occur at the neuromuscular junction lead to the terminal home base potency. The terminal home base possible triggers a series of events that consequences in the contraction of a musculus cell. The full procedure is called the excitement contraction yoke.

4. Describe the three stages of a skeletal musculus vellication. Your reply: The latent stage is the period of clip between the action potency in a musculus cell and the start of musculus contraction. The Concentration stage starts at the terminal of the latent period and ends when the musculus tenseness extremums. The relaxation stage is the period from peak tenseness until the terminal of the musculus contraction.

5. Does the continuance of the latent period alteration with different stimulation electromotive forces? How good did the consequences compare with your anticipation? Your reply: In all of the trials the latent period remained the same. The consequences proved that I was incorrect in my hypothesis. 6. At the threshold stimulation. make sodium ions start to travel into or out of the cell to convey about the membrane depolarisation? Your reply: During the threshold stimulation Na ions move into the cell.