Unit 5 Muscular System (A&P)

Cords of dense connective tissue that connect muscles to bones are called:

• cartilage

• ligaments

• tendons

• joints

Our muscles can act with our bones to form lever systems. The lever system that allows a bicep curl would be considered a __________ and the lever system that allows you to lift your head from your chest would be considered a __________.

• 1st class lever; 2nd class lever

• 2nd class lever; 1st class lever

• 1st class lever; 3rd class lever

• 3rd class lever; 1st class lever

An individual sarcomere unit consists primarily of

• A stack of actin fibers

• A stack of myosin units

• Overlapping actin and membrane

• Overlapping myosin and membrane

• Overlapping actin and myosin filaments

Tags

NGSS.MS-LS1-3

An individual skeletal muscle cell is referred to as a muscle __________.

• aponeurosis

• neuron

• fiber

• axon

__________ muscle is found in organs and blood vessels.

• Cardiac

• Skeletal

• Striated

• Smooth

Tags

NGSS.MS-LS1-3

The heart is made up of __________ muscle cells.

• Cardiac

• Smooth

• Striated

• Skeletal

Tags

NGSS.MS-LS1-3

The ability of a muscle and other tissue to be stretched is the behavioral characteristic known as __________.

• Extensibility

• Elasticity

• Irritability

• Contractibility

A nerve that stimulates skeletal muscle is called a _______________.

• motor neuron

• sensory unit

• sensory neuron

• motor unit

A(n) _______________ is an electrical charge that creates tension within a muscle fiber.

• action potential

• sarcolemma

• cross bridge

• antagonist

What is the role of tropomyosin in muscle contraction?

• To release troponin from tropomyosin

• To release calcium

• To cover actin filament binding sites and prevent myosin from latching on them

• To aid in myosin “cocking”