Apologia Anatomy and Physiology mod 5 the muscular system | Baamboozle - Baamboozle

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the muscular system

Study Slideshow

What is a sarcomere?

sarcomere: the repeating unit of a myofibril

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What is a motor unit?

motor unit: One motor neuron and all the muscle fibers it innervates.

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What is the all or nothing law of muscle contraction?

a principle that states that the strength of a response of a nerve cell or muscle fiber is not dependent upon the strength of the stimulus.

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What does it mean when a motor neuron is recruited?

motor neuron is recruited: it is responding to a stimulus by sending action potentials down its axon.

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What is a threshold stimulus?

: a stimulus that is strong enough to create one action potential in a neuron.

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name and describe the 3 types of muscle tissue, including shape and nucleus.

Skeletal, cardiac and smooth

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What gives us muscle tone?

Partial contraction of a muscle -When only some of the motor units are recruited

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The sarcoplasmic reticulum uses active transport to put calcium back onto the organelles. Is this the beginning or end of the contraction?

End

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Where is the first place muscles find energy when aerobic respiration can't keep up with demand?

Creatine phosphate, Creatine phosphate+ADP=creatine phosphate+ATP Only enough energy for 10-15 seconds of contraction

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What causes rigor mortis?

moving Ca into the sarcoplasmic reticulum requires energy (low to high concentration) so,Ca leaks into the muscles......

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What is the first step of the sliding filament model?

An action potential causes the sarcoplasmic reticulum to release Calcium into the cell

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Who are the bodyguards of the actin myofilament, and what gets them out of the way? (What buys them off)

tropomyosin and tropomin, calcium and ATP

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What causes the sliding part of the sliding filament model?

When the myosin head binds to the actin site and pulls, causing the actin and myosin monofilaments to slide with respect to each other.

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What are the z disks?

a border formed by alternating filaments in a zig zag pattern. it is the anchoring site for the actin myofilaments

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When you see the ending "ase" what does that mean?

it is an enzyme, Acetylcholinesterase, (ACh) it breaks down Acetylcholine. Enzymes are names for the thing they act upon

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What does acetylcholine do?

Neurotransmitter, allows an action potential to cross the synaptic cleft.

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Apologia Anatomy and Physiology mod 5 the muscul ...