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Muslce
| 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 are four major functional characteristics of skeletal muscle? | contractility, excitability, extensibility, and elasticity. |
| What do muscles help produce? | heat essential for maintenance of normal body temperature. |
| Each skeletal muscle is surrounded by a connective tissue sheath called? | epimysium |
| Is another connective tissue located outside the epimysium. | fascia |
| A muscle is composed of numerous visible bundles called fasciculi(fascicle), which are surrounded by loose connective tissue called? | perimysium |
| The fasciculi are composed of single muscle cells called? | fibers |
| Each fiber is surrounded by a connective tissue sheath called the? | endomysium |
| The cytoplasm of each fiber is filled with? | myofibrils |
| What are myofibrils? | A threadlike structure that extends from one end of the fiber to the other. |
| Myofibrils consists of what two major kinds of protein fibers? | Actin myofilaments and myosin myofilaments. |
| Actin and myosin myofilaments form highly ordered units called? | sarcomeres. |
| What are actin myofilaments? | thin myofilaments. They resemble 2 minute strands of pearls twisted together. |
| What are myosin myofilaments? | thick myofilaments. They resemble bundles of minute golf clubs. |
| What is a sarcomere? | the basic structural and functional unity of the muscle. |
| Each sarcomere extends from what? | from one Z line to another Z line. |
| On each side of the Z line is a light area called what? | I band |
| What does the I band consist of? | actin |
| The A band extends what? | the length of the myosin. |
| What is the darker central region in each sarcomere? | the A band. |
| In the center of each sarcomere is another light area called what? | the H zone. |
| What does the H zone consists of? | It consists of only myosin |
| The myosin myofilaments are anchored in the center of the sarcomere at a dark staining band called the? | M line. |
| The charge difference across the membrane is called the? | resting membrane potential. |
| The brief reversal back of the charge is called? | action potential |
| What are motor neurons? | Are nerve cells that carry action potentials to skeletal muscle fibers. |
| What do axons enter? | the muscles and branch |
| Each branch that connects to the muscle forms a ? | neuromuscular junction or synapse |
| A single motor neuron and all the skeletal muscle fibers it innervates are called a ? | motor unit |
| What is a neuromuscular junction formed by? | an enlarged nerve terminal resting in an indentation of the muscle cell membrane. |
| The enlarged nerve terminal is the? | presynaptic terminal |
| The space between the presynaptic terminal and the muscle cell is the? | synaptic cleft |
| Each presynaptic terminal contains what? | synaptic vesicles. |
| Synaptic vesicles secretes a neurotransmitter called what? | acetylcholine. |
| What diffuses across the synaptic cleft and binds to the postsynaptic terminal causing a change in the postsynaptic cell? | acetylcholine |
Created by:
alysongue1
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