Question

Movement Analysis: Consider the following activities. Identify the movements, muscle contractions, and agonist muscles at both the elbow joint and at the radioulnar joint. Assume the right hand is used. Activity

a Radioulnar Joint Elbow
b Joint Movement
c Contraction type
d Agonist(s)
e Movement Contraction type
f Agonist(s)
g Turning a doorknob clockwise and pushing the door open
h Turning the knob counterclockwise and pulling the door open

Answer 1

The movements, muscle contractions, and agonist muscles at the elbow and radioulnar joints depend on the activity. Turning a doorknob clockwise and pushing the door open involve pronation and supination at the radioulnar joint, concentric muscle contractions, and different agonist muscles at the elbow joint.

Step-by-step explanation:

The movements, muscle contractions, and agonist muscles at both the elbow joint and the radioulnar joint vary depending on the activity. For turning a doorknob clockwise and pushing the door open, the movements at the radioulnar joint are pronation and supination.

The muscle contractions are concentric in both cases. The agonist muscles at the elbow joint for pushing the door open are the triceps brachii and anconeus, while for turning the knob counterclockwise and pulling the door open, the agonist muscles at the elbow joint are the biceps brachii and brachialis.