Muscular System A&P Ch.7 Flashcards
What are the tree muscle types?
skeletal, smooth and cardiac
What is the difference between voluntary and involuntary muscles?
Voluntary means that it can be controlled by you, involuntary means that you have no control of its movements
Which muscles are striated?
Cardiac, and skeletal muscle
Sometimes called visceral muscle
- Involuntary muscles
- Found within certain organs, blood vessels, and airways
- Allow for internal movement
- Peristalsis, vasoconstriction, vasodilation
Smooth muscle
What is peristalsis?
The movement of food through the body
What are the characteristics of muscles?
Extensibility
Contractility
Excitability
Elasticity
What is the difference between Tendons and ligaments?
Tendons are fibrous tissues
Ligaments attach bone to bone
What are aponeuroses?
Some muscles attach directly to a bone or soft tissue without a tendon using aponeuroses (broad sheets of connective tissue)
How does movement occur?
Movement of the body is the result of contraction (shortening) of certain muscles while there is relaxation of others
What is the role of the agonist?
the chief muscle(s) causing movement; as the muscle contracts it pulls the bone, causing movement
Where is the point of origin of a muscle?
the end of the muscle that is attached to the stationary bone
Where is the point of insertion of a muscle?
muscle end attached to the moving bone
Synergistic muscles….
help/assist the primary mover
What causes movement in the opposite direction of the agonist?
antagonist
How can muscles be named?..
- Muscle location (biceps brachii brachii = arm)
- Number of origins (biceps brachii has two origins biceps = two heads)
- Action (adductor longus adducts the thigh)•Size (gluteus maximus – maximus = biggest)
- Location of attachments (brachioradialis – radialis refers to the radius)
- Shape (deltoid is triangular – delta =triangle)a
