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BSC 105 Muscles
| Question | Answer |
|---|---|
| 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