Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
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
Chapter 6-Muscles
| Four Major Functional Characteristics | contractility, excitability, extensibility, elasticity |
| 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 | ability to recoil to their original resting length after they have been stretched. |
| Epimysium | A connective tissue sheath that surrounds skeletal muscle. |
| Fascia | Is another connective tissue located outside the epimysium. Surrounds and separates muscles. |
| Perimysium | Loose connective tissue that surrounds fasciculi (fascicle) |
| Fasciculi (fascicle) | Numerous visible bundles that compose a muscle. |
| The fasciculi are composed of single muscles cells called what? | fibers |
| Each muscle fiber is a single cylindrical cell containing what? | several nuclei |
| Endomysium | A connective tissue sheath that surrounds each fiber. |
| Myofibrils | A threadlike structure that extends from one end of the fiber to the other. |
| What is the cytoplasm of each fiber filled with? | Myofibrils |
| Myofibrils consist of what 2 major kinds of protein fibers? | actin myofilaments, myosin myofilaments |
| Actin Myofilaments | thin myofilaments. They resemble 2 minutes strands of pearls twisted together. |
| Myosin Myofilaments | thick myofilaments. They resemble bundles of minute golf clubs. |
| Sarcomeres | Are highly ordered units formed from actin and myosin myofilaments. Is the basic and structural and functional unity of the muscle. |
| The arrangement of actin and myosin give what appearance? | a banded appearance |
| I band | a light area on each side of the Z line. |
| The A band | extends the length of the myosin. It is the darker central region in each sarcomere. |
| H zone | a light area in the center of each sarcomere, which consists of only myosin. |
| The myosin myofilaments are anchored in the center of the sarcomere at a dark staining band called what? | M line |
| Resting membrane potential | the charge difference across a membrane. |
| Action potential | the brief reversal back of the charge. |
| Motor neurons | are nerve cells that carry action potentials to skeletal muscle fibers. |
| Each branch of axons that connects to the muscle forms what near the center of the cell? | neuromuscular junction or synapse |
| Motor unit | A single motor neuron and all the skeletal muscle fibers it innervates. |
| Neuromuscular junction | Is formed by an enlarged nerve terminal resting in an indentation of the muscle cell membrane |
| Presynaptic terminal | The enlarged nerve terminal |
| Synaptic cleft | The space between the presynaptic terminal and the muscle cell |
| Postsynaptic terminal | The muscle fiber |
| Each presynaptic terminal contains what? | Synaptic vesicles |
| Acetylcholine | Secrete a neurotransmitter |
| When an action potential reaches the nerve terminal it cause the synaptic vesicles to what? | Release acetylcholine into the synaptic cleft by exocytosis |
Created by:
kylerchilders
Popular Science sets