Muscle Unit Test

What changes occur in the muscle when people "train"?

• more mitochondria
• more capillaries
• more lactic acid
• both a and b

Which of the following statements is false?

• ATP can be made through 3 ways in the body.
• Aerobic respiration can supply energy for hours.
• Direct phosphorylation requires oxygen.
• Anaerobic glycolysis causes lactic acid build up.

Tags

NGSS.HS-LS1-7

NGSS.HS-LS2-3

What type of contraction causes actual shortening of the muscle?

• isometric
• isotoner
• isotonic
• isometer

What object/chemical binds to the troponin on the actin which causes the exposure of the binding sites for the myosin cross bridges?

• Ach
• ATP
• Ca²⁺
• Na¹⁺

The outermost layer of connective tissue surrounding a skeletal muscle is called:

• epimysium
• perimysium
• endomysium
• actin

Myofibrils are composed primarily of:

• actin and myosin
• sarcoplasmic reticulum
• muscle fibers
• fascicles

In order for a muscle to relax, what must happen?

• Acetylcholinesterase must break down Ach.
• Calcium must leave the sarcoplasmic reticulum.
• Myosin must link onto the actin.
• None of the above

The striated appearance of skeletal muscle is due to:

• transverse tubule pattern
• cisternae placement
• actin and myosin overlap
• sarcoplasmic reticulum network

Which of the following is NOT true when comparing fast twitch and slow twitch muscle types?

• red muscle fibers are better suited for endurance activities
• red muscle fibers have a large amount of blood supply
• red muscle fibers depend on anaerobic respiration
• red muscle fibers fatigue slower than white

Tags

NGSS.HS-LS2-3

How does the motor neuron communicate with the muscle?

• sign language
• neurotransmitters
• neurotransports
• neuromoto enzymes