Muscular System

Match the following

• muscle fibers are grouped into bundles

• epimysium

• within the muscle a wispy sheath of connective tissue that surrounds each individual muscle fiber

• endomysium

• surrounds each muscle bundle

• fascicles

• outside the muscle/overcoat of dense irregular connective tissue that surrounds the whole muscle

• Perimysium

Slow oxidative muscle fibers are best suited for endurance activities, such as long distance running, cycling, or rowing.

• running a marathon

• hitting a baseball

• lifting heavy weights at the gym

• running a 100-yard dash

Which muscle-fiber type is best suited for endurance activities, such as long-distance jogging? ​ (a)  

• slow oxidative fibers
• slow glycolytic fibers
• fast oxidative fibers
• fast glycolytic fibers

Match the following

• Repolarization

• Sodium channels are closed and potassium channels are open

• acetylcholinesterase

• breaks down acetylcholine

• Depolarization

• Sodium channels are open and potassium channels are closed

Tags

NGSS.HS-LS1-3

What happens when the voltage-gated ion channels for a region of sarcolemma that is undergoing repolarization

• Sodium channels close and potassium channels open

• Sodium channels open and potassium channels close

• Sodium and potassium channels both close

• Sodium and potassium channels both open

The refractory period in which the muscle will not contract if stimulated occurs during ​ (a)   of the muscle cell

• repolarization
• hyperpolarization
• polarization
• depolarization

The refractory period is

• Restoration of the membrane potential to resting potential

• Propagation of an electrical current along the sarcolemma

• The time when a fiber cannot be stimulated until repolarization is complete

• Depolarization occurring only at the neuromuscular junction

• The initial polarized state of the membrane

Tags

NGSS.HS-PS3-5

The ability of a muscle to recoil or resume its resting length after being stretched ​​ (a)  

• elasticity
• Excitability
• Extensibility
• Contractility

The layer of dense irregular connective tissue that surrounds the entire skeletal muscle is the​ (a)  

• epimysium
• fascicle
• perimysium
• endomysium
• tendon

The ​ (a)   Surrounds each muscle bundle

• Perimysium
• epimysium
• endomysium