Muscular System Quiz

Which of these is NOT a major task of the muscular system?

• Movement for your body

• Heat production for the body

• Maintaining posture

• Making red blood cells

Which type of muscle is involuntary and makes up many of your internal organs?

• skeletal

• smooth

• gastrointestinal

• cardiac

Which type of muscle(s) is/are nonstriated?

• b & c

• a & b

• cardiac muscle

• skeletal muscle

• smooth muscle

Which membrane covers an individual muscle fiber?

• endomysium

• epimysium

• perimysium

What type of channel on the axon terminal is stimulated by an incoming action potential and allows Calcium to enter the axon?

• chemically-gated

• voltage-gated

• myosin-gated

When Calcium ions enter the neuromuscular junction, what neurotransmitter is released across the synaptic cleft?

• Calcium

• Acetylcholine

• K+

• Na+

What attaches muscle to bone?

• ligaments

• tendons

• sliding filaments

• sarcomeres

Which two structures block the active site on an actin filament?

• z-disc & the m-line

• calcium & myosin

• troponin & tropomyosin

• actin & perimysium

When myosin heads make a cross bridge and bend pulling the actin myofilament toward the center of the sarcomere, it is called the ________.

• power stroke

• neuromuscular junction

• return stroke

• ATP contraction

The deltoid is attached to the clavicle and the humerus. Which one of these points is the insertion?

• clavicle

• humerus

• neither, the deltoid doesn't have an insertion