How We Move Flashcards
Is cardiac muscle voluntary or involuntary?
involuntary
Myocytes are made from myofibrils - what are myofibrils made of?
Actin and myosin microfilaments
What are striations caused by?
overlapping actin & myosin microfilaments of the sarcomere
What is an aponeurosis?
A flattened tendon
What do aponeuroses attach?
muscle to soft tissue
Which area of attachment of muscle to bone, the origin or insertion, moves most during contraction?
insertion
What are the 3 actions of the biceps brachii muscle?
flexor of the shoulder, flexor of the elbow and supination of the forearm
What do the anterior fibres of the deltoid muscle do?
flex shoulder
What do the posterior fibres of the deltoid muscle do?
extend the shoulder
What do the middle fibres of the deltoid muscle do?
abduct the shoulder
What permits circumduction of the shoulder?
shallow socket of the glenoid fossa of the scapula
What type of reflexes are “biceps jerk”, triceps jerk”, “knee jerk”& “ankle jerk” reflexes?
stretch reflexes
What is skeletal muscle’s normal reflex response to being stretched?
to contract
What does reflex contraction of the muscle result in?
a brief twitch of its belly or a movement in the normal direction
What is is the synapse where the motor nerve communicates with the skeletal muscle?
neuromuscular junction
