click below
click below
Normal Size Small Size show me how
Stack #1104940
Question | Answer |
---|---|
What is the ability of skeletal muscle to shorten with force? | Contractility |
The capacity of skeletal muscle to respond to a stimulus. | Excitability |
The ability to be streched | Extensibility |
Ability to recoil to their original resting place after they have been streched. | Elasticity |
Connective tissue sheath that surrounds each skeletal muscle | epimysium |
Connective tissue located outside the epimysium. Surrounds and seperates muscles. | Fascia |
Visible bundles that compose the muscle | Fasciculi (Fascicle) |
Loose connective tissue that surrounds the fasciciles. | Perimysium |
Muscle Cells | Fibers |
Connective tissue sheath surrounding each fiber | endomysium |
A threadlike structure that extends from one end of the fiber to the other. | Myofibrils |
Thin myofilaments | Actin Myofilaments. |
Thick myofilaments | Myosin Myofilaments |
Units joined end to end forming the myofibril | Sarcomere |
Basic structural and functional unit of the muscle | Sarcomere |
Attachment site for Actin | Z Line |
Light area on each side of the Z Line consisting of actin | I Band |
Darker central reigon of the sarcomere | A Band |
Light area in the center of each sarcomere consisting of only myosin | H Zone |
Center of the sarcomere, a dark staining band | M Line |
Charge difference across the membrane | Resting membrane potential |
The brief reversal back of the charge in a cell | Action Potential |
nerve cells that carry action potentials to skeletal muscle fibers | Motor neurons |
Each branch that connects to the muscle | Neuromuscular Junction or Synapse |
25. A single motor neuron and all the skeletal muscle fibers it innervates | Motor unit |
Enlarged nerve terminal | Presynaptic Terminal |
The space between the presynaptic terminal and the muscle cell | synaptic cleft |
Muscle Fiber | Postsynaptic Terminal |
Secretes a neurotransmitter called acetylcholine | Synaptic Vesicles |
Neurotransmitter secretion from the synaptic vesicles | acetylcholine |
Enzymes that break down the the acetylcholine | Acetylcholineterase |
The sliding of actin myofilaments past myosin myofilaments during contraction | sliding filament mechanism |
A contraction of an entire muscle in response to a stimulus that causes the action potential in one or more muscle fibers | Muscle twitch |
The level at which the muscle fiber will contract maximally | Threshold |
The phenomenon in which the muscle fibers contrzct maximally | All-or-none response |
The time between application of a stimulus to a motor neuron and the beginning of a contraction | Lag phase |
The time of contraction | contraction phase |
The time during which the muscle relaxes | The relaxation phase |
Where the muscle remains contracted without relaxing | tetany |
The increase in number of motor units being activated is called ________ | Recruitment |
Needed energy for muscle contraction | ATP |
Produced in mitochondria | Atp |
43Shortlived and unstable. Dengenerates to _____ plus phosphate | ADP |
High energy stored molecule stored at rest | creatine phosphate |
45. Without oxygen | Anaerobic respiration |
46. With oxygen | Aerobic Respiration |
47.The amount of oxygen needed in chemical reactions to convert lactic acid to glucose and to replenish the depleted stores of creatine phosphate stores in muscle cells. | Oxygen Debt |
Results when ATP is used during muscle contraction faster than it can be produced in muscle cells. | Muscle Fatigue |
The length of the muscle does not change, but the amount of tension increases during the contraction process. | Isometric |
50. The amount of tension produced by the muscle is constant during contraction, but the length of the muscle changes. | Isotonic |
Constant tension produced by the muscles of the body for long periods of time. | Muscle tone |
Contract quickly and fatigue quickly. | Fast-twitch fibers |
Contract more slowly and are more resistant to fatigue. They are better suited for aerobic metabolism. | Slow twitch fibers |
The most stationary end of a muscle | Origin (head) |
The end of the muscle undergoing the greatest movement. | Insertion |
The portion of the muscle between the origin and the insertion. | The belly. |
Muscles that work together to accomplish specific movements | Synergists |
Muscles that work in opposition to one another | antagonists |
One muscle that plays the major role in accomplishing the desired movement | Prime Mover |
60.Occiptofrontalis | Raises eyebrows |
Orbicularis Oculi | closes eyelids |
Orbicularis Oris | Puckers Lips |
Buccinator | Flattens the Cheek |
Zygomaticus | Smiling |
Leviotao Labii Superiortis | Sneering |
Depressor Anguli Oris | Frowning |
Mastication | The act of chewing |
Muscles involved in chewing: | Buccinator, Temporalis, & Masseter |
Extrinsic Toungue Muscles | Move the tounge |
Intrinisic Toungue Muscles | Change the shape of the tounge |
Prime Mover; Lateral Neck Muscle | Sternocleidomastoid |
Muscle on each side of the vertebral column | Erector Sprine |
Elevates ribs during inspiration | External Intercostals |
Contrasts during forced expiration | Internal Intercostals |
Dome shaped muscle that seperates thoracic cavity from abdominopelvic cavity | Diaphram |
How are muscles named? | Location, size, orientation of fibers, shape, origin, insertion, and function. |
Which part of the muscle undergoes the greatest movement? | Insertion |
Which part of the muscle is most stationary? | Origin;Head |