Several muscles cross the shoulder joint. What describes the actions of these muscles as you lift your arm at the shoulder joint?
a.
All of the muscles contract, but to different extents.
b.
All of the muscles contract equally.
c.
Some of the muscles contract, while other muscles relax.
d.
Some of the muscles contract, while other muscles detach from the bones.

a.

All of the muscles contract, but to different extents.

what's the

starchy vegetables are high in carbohydrates.

starchy vegetables contain more carbohydrates than non-starchy vegetables.

explanation:

there are two primary categories of carbohydrates, essentially differentiated on the basis of their carbohydrate content (which is in the form of starch - a complex carbohydrate):

those vegetables which contain little amounts of starch are termed as non-starchy vegetables, and some examples include: artichokes, broccoli and bean sprouts.

vegetables high in their starch content are distinguished as starchy vegetables, and some examples include: potatoes, chickpeas and corn.