Muscular System Flashcards
prefixes of the muscular system?
Myo, Mys, Sarco
how many muscles are in the human body?
600
the 4 functions of the muscular system are?
1) to contract to cause movement
2) to stabilize the joints
3) to maintain body posture
4) generate heat vital for normal body temperature
characteristics of skeletal muscle are?
1) found attached to bones
2) long cylindrical multinucleate cells
3) very striated
4) voluntary
characteristics of smooth muscle are?
1) found lining the internal organs
2) spindle shaped uninucleate cells
3) no striations
4) involuntary
characteristics of cardiac muscles are?
1) found in the walls of the heart
2) a branching network on uninucleate cells
3) slightly striated
4) involuntary
muscles contain long ribbon like organelles called?
myofibrils
myofibrils contain what?
alternating bands of light (I) and dark (A) bands
myofibrils are made up of what?
sarcomeres->which are made up of myofilaments-> (thick filaments-myosin-dark(A)) + (thin filaments-Aetin-light(I))
what gives muscle its striated appearance?
the arrangement of myofilaments inside the myofibrils
what is muscle tone?
A state of partial contraction of skeletal muscles (involuntary)
effects of aerobic exercise?
stronger, more flexible muscles with greater resistance to fatigue
effects of resistance or isometric exercise?
forcing the muscle to contract with as much force as possible. increases the size and definition of muscle
bringing the distance of two bones closer together (bending)?
flexion
Increasing the distance between two bones (straightening)?
Extension
the movement of a cone along its longitudinal axis?
Rotation
moving a limb AWAY from the midline of the body
abduction (abs bend back away from the midline)
moving a limb TWARD the midline
adduction (adds to mass at the midline)
moving the superior part of the foot toward the shin
Dorsiflexion
depressing the foot (standing on your toes)
Plantar flexion