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
Ch 6
| Question | Answer |
|---|---|
| What is contractility? | Contractility is the ability of skeletal muscle to shorten with force |
| What is the capacity of skeletal muscle to respond to stimulus ? | Excitability |
| What is the ability to be stretched? | Extensibility |
| What is elasticity? | It is the ability to recoil to their original resting length after they have been stretched |
| What is the connective tissue sheath around each skeletal muscle? | Epimysium |
| What is another connective tissue located outside the epimysium? | Fascia |
| A muscle composed of numerous visible bundles are called? | Muscle fasciculi (fascicle) |
| What loose connective tissue surrounds muscle fasciculi? | Perimysium |
| Fasciculi are composed of single muscle cells called what? | Fibers |
| Cytoplasm of each fiber is filled with what? | Myofibrils |
| What are myofibrils? | Myofibrils are a thread like structure that extends from one end of the fiber to the other |
| What are the two major kinds of protein fibers myofibrils consist of? | Actin myofilaments and myosin myofilaments |
| What is the difference between actin myofilaments and myosin myofilaments? | Actin myofilaments are thin myofilaments and myosin myofilaments are thick myofilaments |
| What do both myofilaments form together? | Together they form highly ordered unties called sarcomeres. |
| Where do sarcomeres join together at? | They join together end to end to form the myofibril |
| What is the basic structural and functional unit of the muscle? | Sarcomere |
| True or False. Sarcomere extends from one Z line to another Z line? | True |
| True or False. Each Z line is not an attachment site for actin? | False |
| True or False. The A band extends the length of the myosin | True |
| True or False. An I band is the central region in each sarcomere? | False |
| True or False. Each side of the Z line is a light area called an I band? | True |
| What is the charge difference across a membrane called? | It is called the resting membrane potential |
| What are motor neurons? | They are nerve cells that carry action potentials to skeletal muscle fibers |
| A motor unit is what? | A single motor neuron and all the skeletal muscle fibers it innervates are called a motor unit |
| The enlarged nerve terminal is the? | Presynaptic terminal |
| What is the space between the presynaptic terminal and the muscle cell called? | Synaptic cleft |
| What is the postsynaptic terminal? | It is a muscle fiber |
| What does each presynaptic terminal contain? | They all contain a synaptic vesicle |
| What do synaptic vesicles secrete? | They secrete a neurotransmitter called acetylcholine |
| What is the enzynme that acetylcholine releases? | Acetylcholinesterase |
| How does muscle contraction occur? | Actin and myosin myofilaments slide past one another causing the sarcomeres to shorten |
| What is the sliding of actin myofilaments past mysoin myfilaments called? | It is called sliding filament mechanism |
| What is muscle twitch? | Muscle twitch is a contraction of an entire muscle in response to a stimulus that causes the action potential in one or more muscle fibers |
| What is a threshold? | It is a level a stimulus reaches when muscle fibers react |
| The phenomenon of the muscle fiber contracting maximally is called what? | All-or-none response |
| What is the time between application of a stimulus to a motor neuron and the beginning of a contraction ? | Lag phase |
| The time of contraction is the? | Contraction phase |
| During the time when muscle relaxes is the? | Relaxation phase |
| What is tetany? | Tetany is where muscle remains contracted without relaxing |
| What is the increase in number of motor units being activated called? | Recruitment |
| True or False. You DON'T need ATP for energy for muscle contractions. | False |
| True or False. ATP is produced in the mitochondria. | True |
| True or False. ATP is short-lived and unstable. | True |
| True or False. Creatine phosphate IS NOT another high-energy molecule | False |
| True or False. Synthesized creatine phosphate is made from ATP | True |
| Mitochondria produces what? | ATP |
| What does ATP degenerates to? | ADP |
| When muscles rest they can't stockpile what? | ATP |
| What is anaerobic respiration ? | Without oxygen |
| What is aerobic respiration? | With oxygen |
| The amount of oxygen needed in a chemical reaction to convert lactic acid to glucose is? | Oxygen debt |
| What is the portion of muscle between the origin and the insertion called? | Belly |
| What is the most stationary end of the muscle? | Origin |
| What is the end of the muscle undergoing the greatest movement? | Insertion |
| What are muscles that work together called? | Synergist |
| Muscles that work in opposition to one another are called? | Antagonists |
| Among a group of synergist, if one muscle plays a major role accomplishing the desired movement, it is called? | A prime mover |
| Muscles have names that are descriptive. What are they? | Names as according to their location, size, orientation of fibers, shape, origin, insertion, and function. |
| What do the occipitofrontalis do? | Raise eyebrows |
| What closes the eyelids? | Orbicularis oculi |
| What puckers the lips? | Orbicularis oris |
| Buccinator flatten what? | The cheeks |
| What are the two kissing muscles? | Buccinator and orbicularis oris |
| What does levator labii superioris do? | Sneer |
| Frowing is caused by? | Depressor anguli oris? |
| The zygomaticus is what? | The smiling muscle |
| What are the 4 parts of mastication muscles? | 2 pair of pterygoids, temporalis, and the masseter |
| What changes the shape of the tongue? | Intrinsic tongue muscles |
| What moves the tongue? | Extrinsic tongue muscles |
| What is the group of muscles on each side of the back? | Erector spinae |
| True or False. The muscles of the anterior abdominal wall do not flex or rotate the vertebral column. | False |
| Adducts and flexes the arm | Pectoralis major |
| The deltoid attaches the humerus to the scapula and clavicle, and is the major abductor of the ? | Upper limb |
| What extends the forearm | Triceps brachii |
| What flexes the wrist? | Flexor carpi |
Created by:
LyonsT
Popular Anatomy sets