Ch. 6 Anatomy Cards! Word Scramble
|
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Question | Answer |
Contractility | the ability of skeletal muscle to shorten with force |
Excitability | the capacity of skeletal muscle to respond to a stimulus |
Extensibility | the ability to be stretched |
Elasticity | the ability to recoil to their original resting length after they have been stretched |
Epimysium | connective tissue sheath that surrounds each skeletal muscle |
Fascia | another connective tissue located outside the epimysium; it surrounds and separates the muscle |
Perimysium | loose connective tissue that surrounds fasciculi |
Fasciculi (Fascicle) | numerous visible bundles that make up muscle |
Endomysium | connective tissue sheath that surrounds each muscle fiber |
Muscle Fiber | a single cylindrical cell containing several nuclei |
Myofibril | a threadlike structure that extends from one end of the fiber to the other |
Myofibrils consist of 2 major kinds of protein fibers... | actin & myosin (myofilaments) |
Sarcomere | highly ordered units created by actin & myosin myofilaments, which are joined end to end to form the myofibril |
The basic structural & functional unity of the muscle | Sarcomere |
Each Z line is the site for... | actin |
I bands consist of... | actin |
The H zone consists of only... | myosin |
Resting Membrane Potential | the charge difference across the membrane between the inside (-) & the outside(+) |
Action Potential | the brief reversal back of the charge when a muscle is stimualated |
Motor Neurons | nerve cells that carry action potentials to skeletal muscle fibers |
Neuromuscular Junction (Synapse) | what is formed when each branch connects to the muscle near the center of the cell |
Motor Unit | a single motor neuron and all the skeletal muscle fibers it innervates |
Presynaptic Terminal | the enlarged nerve terminal |
Synaptic Cleft | the space between the presynaptic terminal and the muscle cell |
Postsynaptic Terminal | the muscle fiber |
Synaptic Vesicles | secrete neurotransmitters called acetylcholine |
Acetylcholine | diffuses across the synaptic cleft and binds to the postsynaptic terminal causing a change in the postsynaptic cell |
Acetylcholinesterase | an enzyme that breaks down acetylcholine |
Muscle Twitch | a contraction of an entire muscle in response to a stimulus that causes the action potential in one or more muscle fibers |
Threshold | the point at which the muscle fiber will respond to a stimulus |
Contraction Phase | the time of contraction |
Lag Phase | the time between application of a stimulus to a motor neuron & the beginning of a contraction |
Relaxation Phase | the time during which the muscle relaxes |
Tetany | where the muscle remains contracted without relaxing |
Recruitment | the increase in number of motor units being activated |
ATP is needed for... | energy for muscle contraction |
Origin | the most stationary end of the muscle |
Insertion | the end of the muscle undergoing the greatest movement |
Belly | the portion of the muscle between the origin & the insertion |
Anaerobic Respiration | respiration without oxygen |
Fast-Twitch Fibers | contract quickly & fatigue quickly. (ex. white meat from a chicken's breast) |
Slow-Twitch Fibers | contract more slowly & are more resistant to fatigue (ex. dark meat of a duck's breast or the legs of a chicken) |
Synergists | muscles that work together to accomplish specific movements |
Antagonists | muscles that work in opposition to one another |
Nomenclature | how most muscles are characterized (ex. size, location, orientation of fibers, shape, origin, insertion, function, etc.) |
Occipitofrontalis | raises the eyebrows |
Orbicularis oculi | closes the eyelid |
Orbicularis oris | pucker/ "kissy face" |
Buccinator | flattens the cheeks |
Zygomaticus | smiling muscle |
Levator labii superioris | sneering |
Depressor anguli oris | frowning |
Mastication | 4 pair of chewing muscles |
Intrinsic Tongue Muscles | changes the shape of the tongue |
Extrinsic Tongue Muscles | moves the tongue |
Created by:
rebecca121212
Popular Science sets