Muscle tissue is examined under a microscope. It is striated with one nucleus. What kind of muscle tissue is it?
Cardiac
Thick dark stripes= myosin. What kind of bands are they?
A bands
Neuron
The functional unit of the nervous system, a nerve cell
Bundle of muscle cells
Fascicles
Threshold stimulus
a stimulus strong enough to create one action potential in a neuron
What neurotransmitter is required to start a muscle action potential?
ACh
Area in A band without actin myofilaments
H zone
Muscle tone
the state of partial contraction in a muscle, even when the muscle is not being used
Collagen layer wrapping each fascicle
Perimysium
What releases Ca2+ when the action potential hits the sarcolemma?
Sarcoplasmic reticulum
Thin collagen layer around each cell in the muscle tissue
Endomysium
Actin myofilament has two other proteins for contractions. Name them.
Troponin
Tropomyosin
Motor unit
one motor neuron and all the muscle fibers it innervates
Muscle needs ATP for 10-15 seconds of vigorous energy. What type of energy should be used?
Creatine Phosphate
What two things happen during rigor mortis?
Ca2+ leaks into the muscle and no ATP is being formed to release the contraction
•Thread-like structures extending from cell to cell
•Form striations
•2 types and they cause contraction of muscle
•Actin myofilaments
•Myosin myofilaments
Myofibrils
Wavy lines made of protein and anchor actin myofilaments. Mark boundaries of sarcomere are called
Z Discs
Submaximal stimulus
Stimuli of increasing strength that create more action potentials in more motor neurons
Collagen layer wrapping fascicles together
Epimysium(fascia)
What inactivates Ach to stop the muscle from continuing to contract?
Acetylcholinesterase (Ach-ase)
Recruitment
Muscle fibers in a motor unit contract. All contract maximally.
Do Z disks move closer or further apart when a muscle relaxes?
Further apart
Sarcomere
the repeating unit of a myofibril
Lactic acid is a sign of which type of respiration.
Anaerobic
All-or-none law of skeletal muscle contraction
An individual muscle fiber contracts maximally in response to an action potential