Chapter 9 Notes - Muscles Intro

Multiple Choice

Muscle cells are called

• fasicles

• fibers

• bundles

Multiple Choice

The tough connective tissue surrounding the fascicle is called

• endomysium

• perimysium

• epimysium

Multiple Choice

The cell membrane of a muscle fiber is called the

• sarcoplasm

• sarcolemma

• sarcoplasmic reticulum

Multiple Choice

What is stored in the sarcoplasmic reticulum?

• oxygen

• carbon dioxide

• iron

• calcium

Multiple Select

Which muscle types are involuntary?

• cardiac

• smooth

• skeletal

Multiple Choice

Which muscle type is striated?

• cardiac

• skeletal

• smooth

• cardiac and skeletal

Multiple Choice

What type of muscle is/are voluntary?

• smooth and cardiac

• smooth

• skeletal and smooth

• skeletal

Multiple Choice

The correct order of organization of skeletal muscle tissue from large to small is

• A .muscle, myofibrils, fascicles, muscle fibers, myofilaments
• B. muscle, myofilaments, muscle fibers, fascicles, myofibrils
• C. muscle, fascicles, muscle fibers, myofibrils, myofilaments
• D. muscle, muscle fibers, fascicles, myofilaments, myofibrils

Multiple Choice

a bundle of muscle fibers

• actin
• mysoin
• fascicle
• sarcomere

Multiple Select

Myofilaments are made of

• fascicles

• myosin

• myofibrils

• actin

Multiple Choice

The contractile unit of a muscle made of actin and myosin.

• tendon

• fascicle

• muscle

• sarcomere

Multiple Choice

The epimysium covers

• the entire muscle

• the fascicle

• the muscle fiber

• the myofibril

Multiple Choice

states that the muscle fibers shorten as the actin and myosin filaments pull on each other

• threshold stimulus theory
• sliding filament theory
• neurotransmitter theory
• all or none principle

Multiple Choice

the __ zone of a sarcomere contains no actin filaments while the skeletal muscle is at rest

• H
• Z
• synaptic cleft
• sarcomere

Multiple Choice

a neurotransmitter that stimulates skeletal muscles

• acetylcholine (Ach)
• ATP
• cross bridges
• neuromuscular junction

Multiple Choice

the only energy source that can be used to directly power muscle activity

• acetylcholine (Ach)
• ATP
• cross bridges
• neuromuscular junction

Multiple Choice

what is the function of Calcium during a skeletal muscle contraction?

• connecting to H zone
• connecting to troponin
• connecting to myofibril
• connecting to myosin

Multiple Choice

A mitochondria's role in muscle contraction is the production of...

• Synthesis of ATP
• Metabolism of ATP
• Synthesis of Proteins
• Metabolism of Worn out Proteins

Multiple Choice

Which ion, when present, changes the conformation of tropomyosin?

• Calcium
• Sodium
• Potassium
• Lithium

Multiple Choice

Which of the following occurs first in muscle contraction?

• Myosin /Actin Cross bridge shifts to move actin.
• Phosphate is released form the myosin globular head
• Calcium Enters the Sarcoplasm (Cytoplasm) of the muscle cell.
• ADP is released form the myosin globular head.

Multiple Choice

During muscle contraction the 'Z' Lines will...

• Disappear
• Get Farther apart
• Get Closer Together
• Appear Thicker