Chapter 10 & 11 Flashcards
Zone of overlap is made up of what?
Where thick and thin filaments overlap
What are the proteins found in a sarcomere?
Myosin, actin, titin, troponin and tropomyosin
What is the largesst protein in the human body?
Titin
When contraction occurs the _________ get smaller.
H zones and I bands
Triad is made up of__________________________
One transverse tubue and two terminal cisternae
F actin is made up of_____________
Two rows of G actin
________ is the smallest functional unit of muscle fiber/cell
Sarcomere
All of these are steps in muscle contraction except _________
- Excitation
- Extraction
- Contraction
- Excitation-contraction coupling
Extraction
All of these are layers of connective tissue except _______
- Perimysium
- Epimysium
- Osteomysium
- Endomysium
Osteomysium
What are the neurotransmitters inside the vesicles?
Acetylcline
Dark bands are made up of _________
A band
When calcium is inside this it is relaxed
Terminal cisternae
When contraction occurs this increases
Zones or areas of overlap
This has a head, a tail and when it binds it forms a cross bridge.
Thick filament
What has an active site that can bind to a thick filament?
G actin
One tropomyosin contains how many active sites
7
All of these are functions of muscles except?
- Movement
- Excretion
- Heat production
- Posture
- Guards entrances and exits.
Excretion
All of these are components of thin filaments except
- F actin
- Myosin
- Tropomyosin
- Nebulin
- Troponin
Myosin
What protein holds the tropomyosin molecules in place?
Troponin
All of these are characteristics of skelteal muscles that permit them to function as they do except?
- Extensibility
- Exitability
- Flexibility
- Contractibility
Flexibility
When nerve impulses reach the end of a motor neuron fiber, small vesicles release what substances across the synapitc cleft.
Neurotransmitter
When nerve impulses reach the end of a motor neuron fiber, small vesicles release what substances across the synapitc cleft.
Neurotransmitter
What is another name for cardiac muscle?
Striated involuntary
What causes the inside of muscle cells to become more negative as compared to the ECF?
Na/K ATPase pump
What allows Na ions to move inside skeletal muscle?
nACH
What is the result of Na ions entering the skeletal muscle?
Muscle becomes Depolarized
Skeletal muscle becomes more positive.
Whats another name for skeletal muscle?
Striated voluntary
Whats another name for smooth muscle?
Nonstriated involuntary
This surrounds the entire muscle and has a dense layer of collagen fibers
Epimysium
This divides the muscle into compartments called fasicles
Perimysium
This surrounds individual muscle cells and inerconnects adjacent muscle fibers
Endomysium
Muscle fibers are also called
Muscle cell
Each muscle has two attachment sites called
Origin and insertion
This is surrounded by enomysium and made up of myofibrils.
Muscle fibers
This is surrounded by perimysium and made up of muscle fibers
Muscle fascicle
This is surrounded by epimysium and made up of muscle fascicles
Skeletal muscle
This is surrounded by sarcoplasmic reticulum and made up of sarcomeres.
Myofibrils
This is surrounded by sarcoplasmic reticulum and made up of sarcomeres.
Myofibrils
This is made up of thick and thin filaments
sarcomeres
The following are all parts of a uscle fiber except
sarcomeres
Skeletal muscle can reach how many inches in length?
12
During the embryonic stage, cells called _____ fuse together to form a single muscle fiber
Myoblasts
This is passageways that carry electrical impulses from sarcolemma into cell sarcoplasm
Transverse tubule
This is the cell membrane of muscle fiber that surrounds sarcoplasm
Sarcolemma
This is responsible for skeletal muscle fiber contraction
Myofibrils
Expanded chambers of sarcoplasmic reticulum are called
Terminal cisternae
When contraction occurs the width of _______ remain constant
A bands
A strand of ______ spirals between two rows of G actin holding F actin together
Nebulin
This protein covers G actins “active site” preventing Actin/Myosin from interacting
Tropomyosin
This has three subunits that bind to tropomyosin, G actin and calcium molecule
Troponin
This is the area where nerve and muscle meet
Neuromuscular junction
A motor neuron sends impulse down azon to end of nerve called _____
Synaptic terminal
Another name for action potential is
Electrical impulse
The gap between the muscle and neuron is called
Synaptic cleft
The section of the muscle that holds the nACH receptors is called the
Motor end plate
The motor neuron vesicles release ACH into the
Synaptic cleft
The motor neuron vesicles release ACH into the
Synaptic cleft
ACH floats across synaptic cleft to the muscle and binds to receptors on outside of muscle called
nACH receptors
