Why do muscle cells contract?

Answer 1

Muscles are designed to contract.

Muscles are of two types Voluntary and involuntary. Muscles are formed of many units called sarcomeres. Each sarcomere is with two contractile proteins actin and myosin. When calcium ions are available in sarcomere due to interaction of actin and myosin filaments sarcomere contracts. Actually this process is complicated. But in short muscles are designed to contract.

Sign up to view the whole answer

By signing up, you agree to our Terms of Service and Privacy Policy

Sign up with email

Answer 2

Connor Abernathy

Motor neurons release neurotransmitters at neuromuscular junctions, which causes a cascade of biochemical reactions that lead to actin and myosin filament sliding and contraction of muscle fibers. Muscle cells contract in response to these motor neuron signals.

Sign up to view the whole answer

By signing up, you agree to our Terms of Service and Privacy Policy

Sign up with email

Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.