The contracting unit of a muscle cell is called ______?

• Sarcoplasm

• Sarcolemma

• Sarcomere

• Myofibril

The thick myofilament of a sarcomer is called_______?

• Actin

• Myosin

• Myofibril

• Myofilament

The sarcoplasmic reticulm releases this ion, ______, which binds to troponin causing it to move so that myosin binding sites can be exposed.

• Creatine

• Iron

• ATP

• Calcium

Number three is showing the thin myofilament called?

• Actin

• Myosin

• Z-line

• H zone

What is the connective tissue that surrounds / ensheathes the entire muscle?

• Epimysium

• Endomysium

• Perimysium

• Fasicle

Number 5 is called a _________, know as a discrete bundle of muscle cells?

• Tendon

• Fiber

• Fascicle

• Sarcolemma

Considering there are only two organ types involved in the muscle system, which is 8?

• Tendon

• Ligament

• Bone

• Sarcomere

A muscle cell is called ____?

• Sarcomere

• Muscle Fiber

• Fascicle

• Actin

Which are the correct four functions of the muscle system?

• send signals, produc heat, maintain posture and break down nutrients

• Produce heat, transport oxygen, stabilize joints and make heat

• Connect tissues, send signals, break down nutrients and maintain posture

• Movement, heat production, maintain posture and stabilize joints

This structure innervates (activates) muscle fibers.

• Motor Neuron

• Sarcomere

• Prime mover

• Action potential