Antagonistic muscles!✨💪 Flashcards
When you decide to bend your arm, what happens to your brain?
When you decide to bend your arm, your brain sends an electrical impulse along a neurone, to your biceps muscle.
How do the cells in the biceps muscle respond to this?
The cells in the biceps muscle respond to this electrical impulse by contracting, which makes the whole muscle shorter.
When the biceps muscle contracts, what happens, causing the elbow to bend?
As the biceps muscle is firmly fixed to the scapula at one end and the radius at the other end, the bones are pulled closer when it contracts(gets shorter).The elbow bend.
How does the biceps muscle bend the elbow?
To bend the arm, the biceps contracts(get shorter) and the triceps relaxes. The contracting biceps pulls on the tendon\, so the radius moves upwards.
In what direction can muscles move, and in which can they not, and how?
Muscles can only pull, they cannot push. Muscles generate a force by getting shorter, or contracting, but they cannot generate a force by getting longer.
Since the biceps muscle cannot move in one direction, what do they need to do so?
The biceps muscle cannot straighten the elbow, and needs another muscle to pull it straight again.
Which muscle helps the biceps muscle pull straight?
The triceps muscle helps pull the biceps muscle back straight.
How does the triceps muscle do this?
To straighten the arm, the triceps muscle contracts and the biceps muscle relaxes. The contracting triceps pulls on the tendon, so the ulna moves downwards.
When a muscle is not contracting, what is it doing?
When a muscle is not contracting, it is relaxing.
What are the only two things a muscle can do?
Contracting and relaxing is all that a muscle can do.
How do the biceps muscle and the triceps muscle work together?
To bend the arm, the contracts and the triceps relaxes. To straighten the arm, the triceps contracts and the biceps relaxes.
What are the biceps muscle and the triceps muscle an example of?
The biceps muscle and the triceps muscle are an example of antagonistic muscles.
What are antagonistic muscles?
Antagonistic muscles are two muscles that work together , and when one of them contracts, it moves the bones at the joint, and when the other contrats, it moves it in the opposite direction.
