THE MUSCULAR SYSTEM Critical Thinking and Review Questions 1. Match the item to
ID: 3506999 • Letter: T
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THE MUSCULAR SYSTEM Critical Thinking and Review Questions 1. Match the item to its basic description: the bundle of contractile proteins in a muscle cell the thick myofilaments the jagged "actin backbone" the thin myofilaments the contractile unit between Z-lines Z-line a. b. c. d. e. -Actin Myosin Sarcomere Myofibril 2. Define the following terms: Motor unit Synaptic cleft Neurotransmitter Fascicle 3. Match the muscle to its function: Biceps brachii a. pulls the arm back and down (adducts the arm) Gluteus maximus b. raises (abducts) the arm Deltoid Latissimus dorsi d. bends (flexes) the arm at the elbow joint Trapezius c. pulls the head back (extension), moves and braces the shoulder kicks and rotates the leg backward (extends the leg) e. 4. Why does a muscle perform better when it is warmed up? Summarize the experiment you performed to demonstrate this principle. 5. Briefly explain the connection between lactic acid and "pumping up" a muscle. 112Explanation / Answer
Z- line - c
Actin - d
Myosin- b
Sarcomere- e
Myofibrils- a
Ans 2Motor unit - Motor unit is made up of the motor neuron in the cell and the motor fibres of that neuron present in cell.
Synaptic cleft - It is defined as the space between the two neurons in the chemical synapse is released.
Neurotransmitter- Neurotransmitter are the substance capable of generating a neurotransmitter or action potential in the nerve cells.
Fasicle - It is the arrangement of various muscle fibres in the form of bundles and covered By the perimysium layer of the muscle.
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