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Chapter 6 Muscles
Brandi Gibson
| Question | Answer |
|---|---|
| Muscle Cells | Muscle fibers |
| The ability to to be stretched | Extensibility |
| What surrounds each skeletal muscle? | epimysium |
| What is fascia? | Another connective tissue located outside the epimysium. |
| What are Motor neurons? | nerve cells that carry action potentials to skeletal muscle fibers. |
| Each branch that connects to the muscle forms what? | Neuromusclular junction |
| What does each preynaptic terminal contain? | synaptic vesicles |
| Muscle twitch | a contraction of an entire muscle in response to a stimulus that causes the action potential in one or more muscle fibers |
| A muscle fiber will not respond to stimulus until that stimulus reaches a level called? | Threshold |
| Contractility | the ability of skeletal muscles to shorten with force |
| What occurs in the absence of oxygen? | Anaerobic Respiration |
| What kind of Muscle fibers fatigue quickly? | Fast twitch fibers |
| Slow Twitch fibers are? | Muscle fibers that are resistant to fatigue |
| What are muscles that work against each other called? | Antagonists |
| Synergists are what? | Muscles that work together |
| Two types of tongue muscles | Intringic and Extrinsic |
| What does the levator superioris enable us to do? | Sneer |
| Occipitofrontals allow us to what? | Rise the eyebrows |
| Buccinator does what? | Flattens the cheeks |
| Mastication does what? | Allows us to chew |
| Zygomaticus lets us? | Smile |
| the whole muscle is surrounded by 2 layers of tissue called what? | Fascia and epimysium |
| What is the condition in which the muscle remains contracted without relaxing is called? | Tetany |
| What is a muscle twitch? | A contraction of an entire muscle in response to stimulus |
| Aerobic respiration occurs when? | In the presence of oxygen |
| Which tongue muscle changes the shape of the tongue? | Intrinsic |
| What muscle closes the eyelid? | Orbiculoris oculi |
| Triceps brachii | extends the forearm |
| Where is the latissimus dorsi? | the back muscles |
| What does the rotator cuff do? | Attaches the humerus to the scapula |
| Flexor carpi | flexes wrist |
| Extensor carpi | extends wrist |
| Rentinaculum (bracelet) | covers flexors and extensors and holds them in place |
| How many hand muscles are there between the metacarpals? | 19 |
| Pectoralis major | chest muscle, adducts and flexes the arm |
| Linea alba | extends from the sternum to the navel to the pubis |
| What does the Gluteus maximus control? | Buttocks/It rotates the thigh |
| What is a common injection site? | The Gluteus meduis |
| Sternocleioidmastoid? | Prime mover lateral neck muscle-rotates and abductes the head |
| External Intercostals | elevates ribs during inspiration |
| Internal Intercostals | Contracts during forced expiration |
| Diaphram | Is used during quiet breathing |
| Orbicularis oris | puckers the lips |
| Depresser anguli oris | frowning |
| What is the beginning of a contraction called? | Lag phase |
| The increase in number of motor units being activated is called? | Recruitment |
| A single motor neuron and all the skeletal muscle fibers it innervates are called? | Motor unit |
| Excitability | the capacity of skeletal muscle to respond to a stimulus |
| Elasticity | ability to recoil to their original resting length after they have been stretched |
| Each muscle fiber is a single cylindrical cell containing several what? | Nuclei |
| myofibrils? | threadlike structure that extends from one end of the fiber to the other |
| Why does muscles produce heat? | its essential for maintenance of normal body temperature |
| Myofibrils consists of what 2 kinds of proteins? | actin myofilameants and myosin myofilaments |
| Actin and myosin myofilaments form highly ordered units called what? | sarcomeres |
| Flexor digitorum | flexes fingers |
| extensor digitorum | extends fingers |
| How many muscles are in the foot? | 20 and they are called intransit |
Created by:
Brandibejeweled
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