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BSC 105 Muscles

QuestionAnswer
what are the 4 characteristics of muscle contraction? Contractility,excitability,extensibility, elasticty
What is the most superficial layer of tissue? Fascia
What do muscles produce? Heat
What is loose connective tissue surrounded by? Perimysium
What is fiber surrounded? A connective tissue sheath called Endomysium
What is skeletal muscle surrounded by? Epimysium
What are the two major kinds of protein fibers? Actin Myofilaments and Myosin myofilaments
What are muscle cells? Muscle fibers
What is the charge difference across the membrane called? resting membrane potential
What is the brief reversal back of the charge called? Action Potential
Define Motor neurons they are nerve cells that carry action potentials to skeletal muscle fibers
What is a single motor neuron and all the skeletal muscle fibers it innervates? Motor Unit
What is anterior thigh muscle? Quadriceps femoris
What is posterior thigh muscle? Hamstrings
What is a tetany? where the muscle remains contracted without relaxing
Buttocks Gluteus Maximus
Chest Muscle Pectoral Muscle
Back Muscle Latissimus dorsl
Closes the eyelid orbicular ocull
Puckers the mouth orbicular Oris
Flattens the cheek Buccinator
Adenosine triphosohate ATP
What are the 4 pairs of mastication muscles? 2 pair of pterygoids, temporalis,masseter
Occipitofrontalis Raise of the eyebrows
Orbicularis oculi Closes the eyelids and causes “crows feet”
Orbicularis Oris Puckers the lips
Zygomaticus Smiling muscle
Levator labii superioris Sneering
Depressor Angelo oris Frowning
Intrinsic tongue muscles Change the shape of the tongue
Extrinsic tongue muscles Move the tongue
Trapezius Rotates scapula
Serrated Anterior Pulls Scapula anteriorly
Pectoralis major Addicted and flexes the arm
Latissmus dorsi Medially rotates, adduced, and powerfully extends the arm
Deltoid Attaches the humerus to the scapula and clavicle and is the major abductor of the upper limb
Triceps brachii Extends the forearm
Biceps brachii Flexes the forearm. occupies the anterior compartment of the arm
Brachialis Flexes forearm
Brachioradialis Flexes and supinates forearm
Retinaculum Strong band of fibrous connective tissue that covers the flexor and extensor tendons and holds them in place
Flexor carpi Flexes the wrist
Extensor carpi Extends the wrist
Flexor digitorum Flexes the fingers
Extensor digitorum Extends the finger
19 hand muscles Intrinsic hand muscles
Quadriceps femoris Extends the leg
Gastrocnemius and Soleus Form the calf muscle
The lateral muscle of the leg Peroneus
20 muscles in the foot Intrinsic foot muscles
The tendinous area of the abdominal wall Linea alba
On each side of the linea alba Rectus abdominis
Cross the rectus abdominus at three mor locations Tendinous inscriptions
The muscles of the anterior abdominal wall flex and rotate the vertebral column Abdominal wall muscles
Muscles located between the metacarpals interossi mucsles
Hip muscles and common injection site Gluteus medius
Sartorius Tailors the muscle and flexes the thigh
The lateral muscles of the leg Peroneus
The charge difference across the membrane Testing membrane potential
Each presynaptic terminal contains Synaptic vesicles
Synaptic vessels secrete a nuerotransmitter called Acetylcholine
Muscle twitch A contraction of an entire muscle in response to a stimulus
The time between application of a stimulus to a motor neuron and the beginning of a contraction is called The lag phase
The increase in number of motor units being activated is called Recruitment
The ability of skeletal muscle to shorten with force Contractility
The ability to be stretched Extensibilty
The capacity of skeletal muscle to respond to a stimulus Excitability
Ability to recoil their original resting length after they have been stretched Elasticity
The cytoplasm of each fiber is filled with Myofibrils
The brief reversal back of the charge is called Action potential
The charge difference across the membrane is called Resting membrane potential
What extends the length of the myosin The A band
What line is an attachment site for actin Z line
What’s the all or none response A muscle fiber will not respond to stimulus until that stimulus reaches threshold
The time of contraction is the Contracting phase
The time during which the muscle relaxes The relaxation phase
Created by: gracieperdue