Exercise 2: Skeletal Muscle Physiology: Activity 1: The Muscle Twitch and the Latent Period Lab Report Pre-lab Quiz Results You scored 20% by answering 1 out of 5 questions correctly. 1. Skeletal muscles are connected to bones by Your answer : c. ligaments. Correct answer: b. tendons. 2. Skeletal muscles are composed of hundreds to thousands of individual cells called Your answer : b. myofibrils. Correct answer: c. fibers. 3. The term motor unit refers to Your answer : a. all of the motor neurons
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show that measurements of muscle twitches from the easily prepared sciatic nerve/gastrocnemius preparation of the frog can allow one to perform experiments involving TWIN-PULSE FACILITATION. The advantages of measuring muscle twitches over electrophysiological parameters are as follows: 1. Students with minimal background can quickly learn to prepare the nerve/muscle preparation for physiological recording and for experimentation dealing with synaptic efficacy. 2. Muscle twitch recordings are population
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Skeletal Muscle Mechanics 1. What is a skeletal muscle fiber? Present (and explain) a diagram that demonstrates the interaction between actin and myosin during contraction. What is the role of calcium‚ troponin‚ and tropomyosin? 2. Present the basic anatomy of a motor neuron input into skeletal muscle. How is each muscle fiber innervated? What is a motor unit? What are the advantages/disadvantages of large and small motor units? What kinds of muscles contain these units
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when playing contact sports‚ the joints that are covered in articular cartilage can be worn away at a more rapid rate. Indeed‚ some injuries even lead to the cartilage being taken out altogether. This is a negative effect of contact sports on the skeletal system of young people as they may well end up suffering from osteoarthritis later in life. Osteoarthritis is thought to be related to cartilage being worn down to the point that the bone is no longer protected. High impact sport is generally
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Organization of Skeletal Muscle Skeletal Muscle Cells and Their Packaging into Muscles 1. Use the items in the key to correctly identify the structures described below. G C ____________ ________ I ____________ ________ E ____________ ________ A ____________ ________ J ____________ ________ D ____________ ________ ____________ ________ 1. 2. 3. 4. 5. 6. 7. connective tissue ensheathing a bundle of muscle cells bundle of muscle cells c. contractile unit of muscle a muscle cell thin reticular
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matrix may contain special substances such as salts and fibers that are unique to a specific tissue and gives that tissue distinctive characteristics iii. List the four types of tissue. Four main tissue types in the body: epithelial‚ connective‚ muscle‚ and nervous iv. Click on Epithelial Tissue 2. Epithelial Tissue (13 points) a. List 6 different uses of epithelial tissue: Functions of the epithelial tissue are protection‚ secretion‚ absorption‚ excretion‚ filtration‚ diffusion‚ and sensory
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membrane Taste Buds Skin Skin Skin Skin Various Muscle Spindle Golgi tendon organ RECEPTOR Rods and Cones Hair Cells Hair Cells Hair Cells Olfactory Neurons Taste Receptor Cells Nerve Endings Nerve Endings Nerve Endings Naked Nerve Endings Nerve Endings Nerve Endings Nerve Endings SENSORY MODE Vision Hearing Rotational acceleration Linear acceleration Smell Taste Touch – Pressure Warmth Cold Pain Joint Movement and Position Muscle Length Muscle Tension All sensory information arrives at the
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curare and manually breathing for them. Further research continued and in 1846 Claude Bernard published details that when curare was injected into the nerve of a frog failed to abolish muscle contractions in response to either nerve stimulation or direct muscle stimulation‚ proof that curare acted at the nerve-muscle junction (Raghavendra‚ 2002‚ p. 363). There are two groups of neuromuscular blockers‚ the depolarizers and the non- depolarizers. A few drugs that fall under the non-depolarizing agents
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completes the statement or answers the question. 4) The cell responsible for secreting the matrix of bone is the: A) osteoblast. 5) What kind of tissue is the forerunner of long bones in the embryo? C) hyaline cartilage 6) The most abundant skeletal cartilage type is: B) hyaline. 7) The periosteum is secured to the underlying bone by dense connective tissue called: A) Sharpey’s fibers. 8) Which hormone increases osteoclast activity to release more calcium ions into the 8) bloodstream
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shoulder girdle Question 5 1 out of 1 points The calcium that triggers muscle contraction is stored in Answer Selected Answer: D. the sarcoplasmic reticulum (also known as the smooth ER). Question 6 1 out of 1 points The contacting surfaces of a moving joint‚ such as your hip joint‚ consist of Answer Selected Answer: B. cartilage. Question 7 0 out of 1 points Functionally‚ the muscle fiber’s fundamental unit of contraction is the Answer Selected Answer: D. Z line
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