1. The tendency of a stretched muscle fiber to return to its original length is called ______.
2. One motor nerve fiber and all the muscle fibers innervated by it are called a _________ _______.
3. A plasma membrane is said to be ______________ if there is a difference in charge on opposite sides of it.
4. The ____________ ___________ theory is the current model of how a muscle fiber contracts.
5. A resting muscle is normally in a state of partial contraction called _________________.
6. A muscl…
In a resting muscle, the __________ contains a concentrated solution of calcium.
Motor nerve fibers release a neurotransmitter called ____, which make skeletal muscle fibers contract.
e tendency of a stretched muscle fiber to return to its original length is called ______.
One motor nerve fiber and all the muscle fibers innervated by it are called a _________ _______.
A plasma membrane is said to be ______________ if there is a difference in charge on opposite sides of it.
The ____________ ___________ theory is the current model of how a muscle fiber contracts.
A resting muscle is normally in a state of partial contraction called _________________.
A muscle fiber will not contract unless it is depolarized to a voltage called its __________.
Several body orifices are regulated by circular muscles called
Muscle fibers are arranged in bundles called
A muscle that prevents unwanted movement of a bone is called a
Each muscle fiber is surrounded by its own connective tissue sheath called the
The bone at a muscle's __ shows little or no movement when that muscle contracts
A __ is a muscle that contracts to move a bone
The muscle of the lips is the
The prime mover of neck flexion which allows us to bow out head is the
The largest muscle of the upper back is the
The linea alba seperates the right and left ___ muscles
After about 30 minutes, _____ becomes the major energy feuls of muscles
The amount of oxygen required after exercise to replenish stores of oxygen, ATP, creatine phosphate, and glucose is called
Which muscle is voluntary
Muscles stores energy in
In a relaxed muscle fiber, the active sites of actin are blocked
Each end of sarcomere is marked by a
During the time that a muscle is shortening but maintaining constant tension it is undergoing _____________ contraction.
The region of a sarcomere where actin and myosin overlap is the _______ band.
When there is not enough oxygen to create ATP by aerobic respiration, a muscle fiber can produce ATP by borrowing phosphate groups from
Regulatory proteins of the myofilaments are ____________________ and ___________________.
troponin and tropomysin
Contractile proteins of the myofilaments are _________________ and ___________________.
actin and myosin
Which of these processes occurs during the contraction of skeletal muscle?
Z discs move closer together
73. Which of the following is NOT found in the thin filaments of striated muscle? A. F actin B. ATPase C. troponin D. tropomyosin E. Ca2+ receptors
In contrast to red muscle fibers, white fibers
fatigue more quickly
The loss of muscle mass from disuse is called
Posture is maintained mainly by
slow motion fibers
A motor unit is
One nerve fiber and all the muscle fibers innervated together
80. After a muscle fiber has exhausted its stores of ATP and creatine phosphate, it switches to _______ as a source of energy. A. glycolysis B. fat oxidation C. aerobic respiration D. anaerobic fermentation E. creatine kinase
If a poison inhibits the activity of acetylcholinesterase, a muscle
May be unable to relax
Fatigue of muscle is due to the build up of
A bundle of muscle fibers is
The thick filament of a sarcomere of a skeletal muscle cell contains
The union between a nerve fiber and a muscle fiber is the
The thin filament of a sarcomere of a skeletal muscle cell contains
The movable end of a muscle is the
The immovable end of the muscle is the
What chemical is realeased from the neuron end plates?
When myosin heads bind to the actin sites, and actin-myosin____ is formed
A single stimulus to a muscle fiber results in a
Refers to a single, sustained muscle contraction
A motor unit must be polarized to its ___ before action potential will occur
the three phases of a twitch are
1.latent 2.contraction 3.relaxation
What contraction is the force generated by the muscle does not change, but the muscle's length changes
In what is glucose used to create a small amount of ATP without using oxygen?
In what is ATP produced in greater quantity, but oxygen is required