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 anatomy
study
| 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 | ability to recoil to their original resting length after they have been stretched |
| what do muscles help produce? | heat, essential for maintenance of normal body temperature |
| epimysium | what connective tissue sheath is it that surrounds each skeletal muscle |
| fascia | another connective tissue located outside the epimysium, it surrounds and separates muscles |
| a muscle is composed of numerous visible bundles called.. | muscle fasciculi |
| the muscle fasciculi are surrounded by loose connective tissue called.. | perimysium |
| the fasciculi are composed of single muscle cells called.. | fibers |
| what does each muscle fiber contain | several nuclei |
| each fiber is surrounded by a connective tissue sheath called the.. | endomysium |
| the cytoplasm of each fiber is filled with.. | myofibrils |
| myofibrils | a threadlike structure that extends from one end of the fiber to the other |
| actin myofilaments | thin myofilaments |
| what do actin myofilaments resemble | 2 minute strands of pearls twisted together |
| myosin myofilaments | thick myofilaments |
| what do myosin myofilaments resemble | bundles of minute golf clubs |
| what do actin and myosin myofilaments form | highly ordered units called sacromeres |
| sacromeres are joined together end to end to form what | the myofibril |
| the sacromere is the basic structural and functional unity of the what | the muscle |
| eac sacromere extends from one ___ line to another ___ line | Z line |
| each z line is an attachment site for what | actin |
| the arrangement of actin and myosin give a what appearance | banded |
| what is on each side of a z line | an I band |
| what does an I band consist of | actin |
| the A band extends the length of the what | of the myosin |
| it is the _____ central region in each sacromere | darker |
| in the center of each sacromere is another light area called the what | the H zone |
| what does the H zone consist of | only myosin |
| the myosin myofilaments are anchored in the center of the sacromere at a dark staining band called the what | the M line |
| the outside of most cell membranes is ____ charged | positively |
| the inside of the cell membrane is _____ charged | negatively |
| the charge difference across the membrane is called the what | the resting membranepotential |
| when a muscle cell is stimulated the membrane characteristics do what | they change breifly |
| the brief reversal back of the charge is called the what | the action potential |
| motor neurons | are nerve cells that carry action potentials to vthe skeletal muscle fibers |
| axons enter the what and branch | the muscle |
| each branch that connects to the muscle forms a what | neuromuscular junction |
| what else does it form | synapse |
| where is the synapse formed | near the center of the cell |
| a single motor neuron and all the skeletal muscle fibers it innervates are called a what | a motor unit |
| many motor units form a what | a single muscle |
| a neuromuscular junction is formed by what | an enlarged nerve terminal resting in an indentation of the muscle cell membrane |
Created by:
nygiantfan2
Popular Anatomy sets