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Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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A scientist extracts and measures the calcium content of one of your muscle fibers while you are asleep, when all of your muscles are relaxed. Where is the scientist likely to find calcium?
In the T-tubules
In the sarcoplasmic reticulum
Bound to tropomyosin
Bound to troponin
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- What two types of muscle cells need both extracellular and introcellular calcium to contract? Skeletal muscle and smooth muscle Skeletal muscle and cardiac muscle Smooth muscle and cardiac musclearrow_forwardThe sarcoplasmic reticulum releases ____________________ into the sarcoplasm. When Ca++ binds to troponin it exposes the _______________________ on the thin filament. In order for a cross bridge to form ______________________ must bind to the myosin head.arrow_forwardThe role of creatine phosphate in muscle cells is to: provide energy for muscles during extended physical activity (greater than 20 minutes) split glucose in two accept electrons "recharge" spent ATP in the first several seconds of a muscle contraction shuttle H atoms to the ETCarrow_forward
- Which of the following happens within the sarcomere during muscle contraction? The myosin filaments "walk" along the actin filaments bidirectionally towards the Z lines. The myosin filaments shorten. The actin filaments shorten. The H bands and I bands both increase in width.arrow_forwardWhich of the following does NOT limit normal clot growth to the sight of injury? O A) Removal and dilution of clotting factors O B) Fibrin binding to thrombin O C) Antithrombin III D) Exposed collagen fibers O E) Serotoninarrow_forwardWhat event occurs immediately before the movement of tropomyosin? Initiation of the power stroke Cross bridge formation Active sites on actin are revealed Release of calcium from terminal cisternae Troponin changes shapearrow_forward
- Explain the purpose of calcium in contractile cell and skeletal muscles movementarrow_forwardPlease choose all that can be used as a chemical energy source in muscle cells. Myosin Mitochondria Lactic Acid ATP Creatine Phosphate Put the following in order of size from smallest to largest microtubules sarcomere intermediate filaments microfilaments dynien SNARES (choose all that apply) are found on the lysosome membrane are found on the golgi membrane are found on vesicles are found on the cell membrane are found on the ER membranearrow_forwardWhich statement or statements describe the role of calcium in the stimulation of muscle fibers? Select all that apply. When the action potential reaches the axon terminals of a neuron, calcium channels open and calcium floods into the axon terminal, triggering the release of synaptic vesicles. When calcium ions flood out of the sarcoplasmic reticulum, they bind troponin molecules and troponin removes tropomyosin from the active sites on thin filaments. When myosin thick filaments are walking along actin thin filaments (the cross bridge cycle), calcium ions must be available to bind to myosin so that it can let go of the thin filaments and take another "step". When synaptic vesicles fuse with the plasma membrane of axon terminals, calcium is released into the synaptic cleft and binds to receptors in the motor end plate.arrow_forward
- The region of the muscle fiber involved in a neuromuscular junction is called the: Group of answer choices Voltage-gated ion channels Synaptic end bulb Synaptic cleft Motor end plate Synaptic vesiclearrow_forwardComplete the following analogies: Troponin is to skeletal muscle as tropomyosin is to smooth muscle Neuromuscular junction is to skeletal muscle as striations is to smooth muscle Oxidative metabolism is to slow twitch fibers as sliding filament theory is to fast twitch fibers if it is wrong let me know what might be the correct answer.arrow_forwardHow would ine generate more muscle tension to pick up something heavy? Increase activation of motor units Increase muscle tone Decrease calcium release Decrease muscle hypertrophy Decrease muscle hyperplasiaarrow_forward
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