Muscular System

Which of the following types of muscle tissue is found within your digestive system and used to move food through your esophagus, stomach, and intestines?

• smooth

• skeletal

• cardiac

• gastrointestinal

Which of the following types of muscle tissue is striated and used to control your voluntary muscles?

• smooth

• skeletal

• cardiac

• gastrointestinal

A bundle of muscle fibers is called a...

• muscle

• myofibril

• perimysium

• fascicle

Muscles are made of bundles upon bundle of fibers. Which is the correct order from smallest to largest in this organizational structure of a muscle?

• fascicle, muscle fiber, myofibril, muscle

• muscle fiber, myofibril, fascicle, muscle

• myofibril, fascicle, muscle fiber, muscle

• myofibril, muscle fiber, fascicle, muscle

Which of the following membranes surrounds an entire muscle?

• epimysium

• perimysium

• actin

• endomysium

Which structure is the sarcomere in the diagram above?

• A

• B

• C

Which two structures engage to create a muscle contraction?

• fascicle & actin

• actin & perimysium

• troponin & tropomyosin

• actin & myosin

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

• fascicle & actin

• actin & perimysium

• troponin & tropomyosin

• actin & myosin

A muscle fiber cannot contract until _____ rushes in from a nerve cell to remove the blocking molecules and make the active site available to be engaged.

• ATP

• calcium

• myosin

• sarcomeres

When a myosin head engages with the active site on the other filament, this is known as a(n) ...

• sarcomere

• cross-bridge

• Z-line

• M-line