Which joint is capable of circumduction?
A. Shoulder
B. Jaw
C. Knee
D. Elbow
Of course, shoulder, the arm can make a circular arc, as can the hip joint. You really ought to look up words you don't know.
I have a hard time with this question:
During a windstorm, something is blown into your eye causing you discomfort. You immediately rub
your eye to try to remove the particle. What part of the eye might be irritated by this rubbing?
A. Optic nerve
B. Cornea
C. Sclera
D. Retina
I think it is D but not sure. I have all my answers on the paper but not sure if they are correct so this is why I am asking someone to check it.
Have you looked at a diagram of the eye?
https://www.google.com/search?client=safari&rls=en&q=eye+anatomy&ie=UTF-8&oe=UTF-8
The joint that is capable of circumduction is the shoulder joint.
To arrive at this answer, let's first understand what circumduction means. Circumduction is a movement that combines flexion, extension, abduction, and adduction in a continuous, circular manner. Think of it as the movement of tracing a cone with your limb.
Now, let's consider each option:
A. Shoulder: The shoulder joint consists of the glenohumeral joint, where the head of the humerus articulates with the glenoid fossa of the scapula. This joint allows for a wide range of movements, including circumduction.
B. Jaw: The temporomandibular joint (TMJ) is responsible for opening and closing the mouth and moving the jaw from side to side (lateral excursion) and forward and backward (protrusion and retrusion). While the jaw joint can move in multiple directions, it does not have the ability to perform circumduction.
C. Knee: The knee joint is a hinge joint that primarily allows flexion and extension. While the knee joint can slightly rotate when flexed, it does not have the freedom of movement required for circumduction.
D. Elbow: The elbow joint is another hinge joint that primarily allows flexion and extension, similar to the knee joint. It lacks the necessary range of motion for circumduction.
Therefore, the correct answer is A. Shoulder.