Question

How muscles attached to the bones move the body.
A. Automatically
B. Pull movement only
C. Push movement only
D. Pull and push movement

Answer 1

Hint: Coordination is very important for the proper functioning of the body. Muscular system coordinate with the skeletal system, Respiratory and Circulatory system coordinate, Digestive and circulatory coordinate with each other to accomplish a given task.

Complete answer
Skeletal muscles are covering the entire skeletal system and are attached to the bones by connective tissues called tendons. Antagonistic muscles are the muscles which coordinate the movement of two complementary muscles such as Bicep and Triceps. To accomplish the folding of arm bicep muscles contract and triceps relax and the same phenomenon works in the movement of the leg or any other part of the body. The muscles which contract are called flexors and the muscles which relax or extend are called extensors. The flexors and the extensors work in the opposite direction of a body part.
Automatic movement of muscles is all of a sudden movement which happens occasionally or commonly known as Reflex action.
Pull movement is shown by the muscles to carry out any function of the body while performing any task.
Push movement is not shown by the muscles at all since the movement of bones is based on types of joint as well. Hinge joint which is present at the elbow and knee allows only one directional movement and not on the opposite side of it.
Push and pull movement: This movement is shown by the doors which can be opened in both the direction inward and outward but the human body doesn’t have such movement provision.
Muscles work by contraction and relaxation
Muscles require ATP to relax as well as to contract.
Calcium ions play an important role in muscle contraction.

Note:Skeleton muscles provide surface for attachment of muscles and a system of lever and pivots for muscles to pull against, enabling them to work in moving body parts in locomotion. Skeletal muscles are voluntary in nature i.e. can act according to the will and get fatigue faster.