How muscles work

What is a sarcomere?

• The contractile units of muscle fibres

• Microscopic representation of a tendon

• another word for fascilicus

• The muscle fibre

The insertion of a muscle refers to

• The connection to the bone with no tendon

• The end of the muscle belly

• The part of the muscle that attacched to a bone via a tendon

• a reference to a multipennate muscle

A muscle fibre consists of

• bone and fats

• mitochondria, myoglobin and ATP

• Myson and Actin

• Fats, Carbs and Bone

Myosins action during contraction is

• To attach to actin fillaments and movement

• to be moved by actin

• to relax during contraction

• to hold actin in place

Muscle tone is

• Good for you

• when some myosin filaments stay in contact with actin

• Make you have bad posture

• cause muscle tightness and cramping

What happens to the H-Zone during a muscle contraction

• It gets wider

• It stays the same width

• The H-Zone width descreases

• H-Zone width is unpredicatble

During a muscular contraction

• Actin filaments move closer together

• Actin moves the myosin filaments

• Actin has no action during muscular contraction

• Actin is dependent on the engagement of the Z-Line

During muscle contraction

• All sarcomeres along a muscle fibre contract

• Only some sarcomeres in a muscle fibre contract

• every 2nd sarcomere will contract

• Sarcomeres contract at different times