Muscle Activity & Anatomy

Muscle contractions in skeletal muscle are all about the interaction of _________ & __________.

• myofilament & actin

• myosin & acetylcholine

• actin & myosin

• axon terminals & neuromuscular junctions

When actin and myosin interact, the muscle, using _______, contracts, which causes all muscle motion.

• ATP energy

• kinetic energy

• potential energy

• chemical energy

A motor neuron and all of the skeletal muscle cells it stimulates is called a ______?

• synaptic cleft

• motor unit

• sarcomere

• neuromuscular junction

The actual gap between an atonal ending and the muscle is called a _______?

• perimysium

• synaptic vesicles

• junctional folds

• synaptic cleft

Actin- or myosin-containing structure.

• myfibril

• myofilament

• fascicle

• sarcomere

Contractile unit of muscle

• Sarcomere

• Tendon

• Perimysium

• Epimysium

Thin connective tissue enclosing each muscle cell.

• Caphysium

• Epimysium

• Perimysium

• Endomysium

A long, filamentous organelle found within muscle cells that has a banded appearance.

• Myofilament

• Myofibril

• Fascicle

• Fiber

A discrete bundle of muscle cells.

• Ligament

• Tendon

• Fiber

• Fascicle

_______ is a membrane-bound structure found within muscle cells. The main function of this is to store calcium ions.

• Sarcoplasmic reticulum

• endoplasmic reticulum

• Platysma

• Nucleolus