Anybody's Guess
Sarcomere
Vocabulary
MISC
MISC 2
100

Muscle tissue is examined under a microscope. It is striated with one nucleus. What kind of muscle tissue is it?

Cardiac

100

Thick dark stripes= myosin.  What kind of bands are they?

 A bands

100

Neuron

The functional unit of the nervous system, a nerve cell

100

 Bundle of muscle cells

Fascicles

100

Threshold stimulus

a stimulus strong enough to create one action potential in a neuron

200

What neurotransmitter is required to start a muscle action potential?

ACh


200

 Area in A band without actin myofilaments

H zone

200

Muscle tone

 the state of partial contraction in a muscle, even when the muscle is not being used

200

Collagen layer wrapping each fascicle

Perimysium

200

What releases Ca2+ when the action potential hits the sarcolemma?

Sarcoplasmic reticulum

300

 Thin collagen layer around each cell in the muscle tissue

Endomysium

300

Actin myofilament has two other proteins for contractions.  Name them.

Troponin

Tropomyosin

300

Motor unit

one motor neuron and all the muscle fibers it innervates

300

Muscle needs ATP for 10-15 seconds of vigorous energy. What type of energy should be used?

Creatine Phosphate

300

What two things happen during rigor mortis?

Ca2+ leaks into the muscle and no ATP is being formed to release the contraction

400

•Thread-like structures extending from cell to cell

•Form striations

•2 types and they cause contraction of muscle

     •Actin myofilaments

     •Myosin myofilaments

Myofibrils

400

Wavy lines made of protein and anchor actin myofilaments.  Mark boundaries of sarcomere are called

Z Discs

400

Submaximal stimulus

Stimuli of increasing strength that create more action potentials in more motor neurons

400

 Collagen layer wrapping fascicles together

Epimysium(fascia)

400

 What inactivates Ach to stop the muscle from continuing to contract?

Acetylcholinesterase (Ach-ase)

500

Recruitment

Muscle fibers in a motor unit contract.  All contract maximally.

500

Do Z disks move closer or further apart when a muscle relaxes?

Further apart

500

Sarcomere

the repeating unit of a myofibril

500

Lactic acid is a sign of which type of respiration.

Anaerobic

500

All-or-none law of skeletal muscle contraction

 An individual muscle fiber contracts maximally in response to an action potential