Chapter 6 Anatomy
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| show | the ability of skeletal muscle to shorten with force
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| show | the capacity of skeletal muscle to respond to a stimulus
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| Extensibility | show 🗑
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| Elasticity | show 🗑
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| Epimysium | show 🗑
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| show | located outside the epimysium; surrounds and separates muscles
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| Perimysium | show 🗑
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| show | surrounds each muscle fiber
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| Myofibrils | show 🗑
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| show | Actin and Myosin
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| show | thin myofilaments; resemble 2 minute strands of pearls twisted together
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| Myosin | show 🗑
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| Sarcomere | show 🗑
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| Each sarcomere extends from one ____________ to another __________. Each _______________ is an attachment site for _____________. | show 🗑
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| What gives a sarcomere its banded appearance? | show 🗑
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| On each side of the Z line is a light area called an ______________. It consists of _____________. | show 🗑
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| show | A band
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| What's in the center of each sarcomere? What does it consist of? | show 🗑
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| show | M line
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| show | The charge difference across the membrane (outside is positive, inside is negative)
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| Action Potential | show 🗑
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| show | nerve cells that carry action potentials to skeletal muscle fibers
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| show | synapse; formed by an enlarged nerve terminal resting in an identation of the muscle cell membrane
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| Motor unit | show 🗑
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| Enlarged nerve terminal | show 🗑
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| Sliding filament mechanism | show 🗑
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| show | a contraction of an entire muscle in response to a stimulus that causes the action potential in one or more muscle fibers
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| Threshold | show 🗑
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| show | the time between application of a stimulus to a motor neuron and the beginning of a contraction
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| show | where the muscle remains contracted without relaxing
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| show | recruitment
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| show | ATP: produced in mitochondria
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| ATP is short lived; It degenerates to | show 🗑
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| ATP | show 🗑
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| show | adenosine diphosphate
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| Anaerobic respiration | show 🗑
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| show | with oxygen (more efficient)
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| show | when ATP is used during muscle contraction faster than it can be produced
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| show | (equal distance) the length of the muscle does not change but the amount of tension increases during the contraction process
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| Muscle tone | show 🗑
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| show | contract quickly and fatigue quickly. Well adapted to perform anaerobic metabolism. Ex. white meat of a chicken's breast
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| Slow-twitch fibers | show 🗑
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| show | the most stationary end of the muscle; some muscles can have multiple heads
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| Insertion | show 🗑
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| Belly | show 🗑
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| Synergists | show 🗑
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| Antagonists | show 🗑
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| show | a muscle among a group of synergists that play a major role in accomplishing a desired movement
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| show | raises the eyebrows
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| Orbicularis oculi | show 🗑
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| Orbicularis oris | show 🗑
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| Buccinator | show 🗑
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| Zygomaticus | show 🗑
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| show | sneering
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| Depressor anguli oris | show 🗑
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| show | Chewing; 4 pairs of mastification muscles- 2 pair of pterygoids, temporalis, and masseter
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| show | change the shape of the tongue
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| Extrinsic Tongue Muscles | show 🗑
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| Sternocleidomastoid | show 🗑
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| show | group of muscles on each side of the back. Responsible for keeping the back straight and the body erect
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| Thoracic muscles most involved in breathing | show 🗑
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| External intercostals | show 🗑
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| show | contract during forced expiration
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| show | accomplishes quiet breathing. Dome-shaped muscle. Aids in breathing
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| Muscles of the anterior abdominal wall | show 🗑
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| show | tendinous area of the abdominal wall that consists of white connective tissue rather than muscle
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| On each side of the Linea Alba | show 🗑
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| Tendinous inscriptions | show 🗑
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| Scapula movements | show 🗑
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| show | pectoralis major and latissimus dorsi muscles
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| show | adducts and flexes the arm
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| show | medially rotates, adducts, and powerfully extends the arm. "Swimmer muscles"
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| show | attaches the humerus to the scapula and clavicle, and is the major abductor of the upper limb
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| show | Triceps brachii
Biceps brachii
Brachialis
Brachioradialis
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| Trapezius | show 🗑
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| Serratus anterior | show 🗑
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| Triceps brachii | show 🗑
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| Biceps brachii | show 🗑
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| show | flexes forearm
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| show | flexes and supinates the forearm
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| show | strong band of fibrous connective tissue that covers the flexor and extensor tendons and holds them in place around the wrist so that they do not "bowstring" during muscle contraction
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| Wrist and finger movements | show 🗑
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| show | flexes the wrist
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| show | extends the wrist
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| Flexor Digitorum | show 🗑
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| Extensor digitorum | show 🗑
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| show | intrinsic hand muscles
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| The muscles located between the metacarpals that are responsible for adduction and abduction of the fingers. | show 🗑
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| Gluteus maximus | show 🗑
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| Gluteus medius | show 🗑
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| Leg movements | show 🗑
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| Quadriceps Femoris | show 🗑
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| Sartorius | show 🗑
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| show | posterior thigh muscles; flexes the leg and extends the thigh
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| Gastrocnemius and Soleus | show 🗑
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| show | calcaneal tendon (Achilles tendon); flex the foot and toes
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| show | Peroneus muscles
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| show | Insintric muscles
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