Myscular System Flashcards
What are the three muscle types?
Skeletal striated muscle.
Cardiac striated muscle.
Smooth muscle.
What three things determine muscle tissue characteristics?
Whether it’s voluntary verse in voluntary.
Whether it striated vs. smooth or unstriated.
Whether it’s somatic vs. visceral.
What are the differences between the three muscle types?
Skeletal striated muscle:
voluntary somatic muscle, makes exoskeletal muscles, move and stabilize bones and other structures.
Cardiac striated muscle: involuntary visceral muscle, forms most of the walls of the heart and adjacent parts of the great vessels, pumps blood.
Smooth muscle:
involuntary visceral muscle, forms part of the walls of most vessels and hollow organs (viscera), moves substances through using coordinated sequential contractions (peristalsis)
What portions of the contractile skeletal muscle are fleshy and reddish?
Heads or bellies
White noncontractile portions composed mainly of organized collagen that provide a means of attachment?
Tendons
What is aponeurosis?
Flat sheet formed by some tendons that anchor the muscle to the skeleton and/or the fascia, May also anchor to the aponeurosis of another muscle.
What are the different classifications of muscles?
Flat, fusiform, pennate muscles, quadrate, circular or sphincteral, multi-headed or multi-bellied.
What are the different types of contraction of muscles?
Reflexive contraction, tonic contraction, phasic contraction.
What is an example of a reflex contraction?
Contraction of thoracic diaphragm is controlled reflexively by oxygen and carbon dioxide levels in blood. Can control this within limits.
Movement of a muscle after a stretch to tendon has been induced by tapping with the hammer?
Myotatic reflex
What is a tonic contraction and what are the causes of such a contraction? Or lack thereof?
Slight contraction present in muscles even when relaxed creating muscle tone.
Does not produce movement or active resistance.
Gives muscle a certain firmness to stabilize joints maintain posture.
Keeps muscles ready to respond.
Absent when a deep sleep, under anesthesia and after paralysis.
What are the two main types of phasic contraction?
Isometric and isotonic.
What is considered an isometric contraction? Give an example.
Muscle length remains the same or another words no movement occurs.
An example is maintaining upright posture.
Muscle changes length in relationship to production of this movement. What is this contraction type?
Isotonic contraction.
What are the two types of isotonic contractions? Briefly explain each one.
Concentric contraction is a movement that occurs as a result of muscle shortening.
Eccentric contraction is a lengthening of a contracting muscle. In this contraction a controlled and gradual relaxation occurs while continually exerting a diminishing force.