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Ch6 muscles
| Question | Answer |
|---|---|
| The ability of skeletal muscle to shorten with force | Contractility |
| The capacity of skeletal muscle to respond to a stimulus | Excitability |
| Ability to recoil to their original resting length after they have been stretched. | Elasticity |
| Connective tissue located outside the epimysium | Fascia |
| Surrounded by loose connective tissue | Perimysium |
| Each fiber is surrounded by a connective tissue sheath called | Endomysium |
| Each skeletal muscle is surrounded by a connective tissue sheath called | Epimysium |
| Thin myofilaments | Actin myofilaments |
| Thick myofilaments | Myosin myofilaments |
| Actin and Myosin myofilaments form highly ordered units called | Sarcomeres |
| The charge difference across the membrane is called | Resting membrane potential |
| The brief reversal back of the charge is called | Action potential |
| A single motor neuron and all the skeletal muscle fibers it innervates are called | Motor unit |
| The enlarged nerve terminal is the | Presynaptic Terminal |
| Nerve cells that carry action potentials to skeletal muscle fibers | Motor Neurons |
| Each branch that connects to the muscle forms a | Neuromusclular Junction OR Synapse |
| The enlarged nerve terminal is the | Presynaptic terminal |
| The space between the presynaptic terminal and the muscle cell is the | Synaptic cleft |
| The acetylcholine released into the synaptic cleft between the neuron and muscle cell is rapidly broken down by | Acetylcholinesterase |
| The sliding action myofilaments past myosin myofilaments during contraction is called | Sliding filament mechanism |
| A contraction of an entire muscle | Muscle twitch |
| A muscle finer will not respond to stimulus if stimulus reached a level called | Threshold |
| Phenomenon called | All-or-nothing response |
| The time between application of a stimulus to a motor neuron and the beginning of a contraction | Lag phase |
| The time if contraction is the | Contraction |
| The time during which the muscle relaxes | Relaxation phase |
| Where the muscle remains contracted without relaxing | Tetany |
| The increase in number of motor units being active is called | Recruitment |
| The H and a I bands shorten, but the __ ______ do not change in length | A Bands |
| ___ is needed for energy for muscle contraction | ATP |
| They can store another high energy molecule called | Creatine phosphate |
| Without oxygen | Anaerobic respiration |
| With oxygen | Aerobic respiration |
| The _______ _________ is the amount of oxygen needed in chemical reactions. | Oxygen debt |
| Is used when ATP is used during muscle contraction | Muscle Fatigue |
| The amount of tension increases during the contraction | Isometric |
| The amount of tension produced by the muscle is constant during contraction | Isotonic |
| Keeps head up and back straight | Muscle tone |
| Contacts quickly | Fast twitch fibers |
| Contacts more slowly | Slow twitch fibers |
| Is the most stationary end of muscle | Origin |
| Is the end of the muscle undergoing the greatest movement | Insertion |
| The portion of the muscle between the origin and the insertion is the | Belly |
| Muscles that work together to accomplish specific movements are | Synergists |
| One muscle plays the major role in accomplishing the desired movement, it is the | Prime mover |
| Muscle the works in opposition to one another are called | Antagonist |
| Raises the eyebrows | Occipitofrontalis |
| Cloeses the eyelids | Orbicularis oculi |
| Puckers the lips | Orbicularis Oris |
| Flattens the cheeks | Buccinator |
| The kissing muscles | Orbicularis Oris and buccinator |
| Smiling muscle | Zygomaticus |
| Sneering | Levator labii superioris |
| Frowning | Depressor anguli Oris |
| Mastication= | Chewing |
| 4 pairs of muscles of mastication | 2 pair of pterygoids Temporalis Masseter |
| Change the shape if tongue | Instrinsic tongue muscles |
| Move the tongue | Extrinsic tongue muscles |
| Rotates and abducts the head | Sternocleidomastoid |
| Sheet like muscle that covers the anterolateral neck | Platysma |
| Group of muscles on each side if back | Erector spinae |
| Muscles that move the thorax | Thoracic muscle |
| Most involved in breathing | External and internal intercostals |
| Elevate the ribs during inspiration | External intercostals |
| Contract during food expiration | Internal intercostals |
| Accomplishes quiet breathing | Diaphragm |
| The I band is located between the ______ and __________ | The Z line and A bands |
| What is between the two A bands | H zone |
| What type of myofilaments are in A bands? | Myosin |
| What type of myofilaments are in I bands | Actin |
| What line is in the H Zone | The M Line |
| What is between the two I bands | Z line |
| What is between the two Z lines | Sarcomere |
| ATP is produced in the | Mitochondria |
| Short lived and unstable | ATP |
Created by:
DestinySchultz
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