Muscle Contractile Unit

Muscular System

By Kristin Ambrose

Multiple Choice

In the average person, around _____ % of your body weight comes from muscles.

• 50

• 70

• 20

• 10

Multiple Choice

In a muscle cell, which organelle is responsible for providing energy?

• Vacuole

• Nucleus

• Cytoplasm

• Mitochondria

Multiple Select

Select all of the purposes of the muscular system

• Movement

• Posture

• Generating Heat

• Protection from viruses

Multiple Choice

Which of the following uses voluntary muscles?

• Digestion

• Heart breathing

• Raising your hand

• Sneezing

Multiple Choice

Muscles that you have no control over are called ___________ muscles.

• Involuntary

• Voluntary

• Evolutionary

• Revolutionary

Multiple Choice

Voluntary muscles are attached to

• Cardiac muscles

• Smooth muscles

• Skeletal muscles

• All of the above

Multiple Choice

What are the three types of muscle tissues?

• Skeletal, Red, White

• Cardiac, Smooth, Skeletal

• Red, White, Blue

• Cardiac, Skeletal, Red

Multiple Choice

This muscle is found in the heart and never gets tired.

• Cardiac

• Smooth

• Skeletal

• Strong

Multiple Choice

What kind of muscle is found in the stomach wall?

• cardiac

• smooth

• skeletal

• memory

Multiple Choice

__________ connect muscles to bones

• tendons

• collagen

• joints

• cartilage

Multiple Choice

Decreasing the joint angle, such as pulling your hand up to your shoulder, is known as

• flexing

• extending

• hyperextension

• hyperflexion

Multiple Choice

Increasing the angle of the joint such as pointing your toes is known as

• flexing

• extension

• hyperextension

• hyperflexion

Multiple Choice

Pushing a joint past the point that it is supposed to go is known as

• flexing

• extension

• hyperextension

• hyperflexion

Multiple Choice

Which one of the following is a key characteristic of slow twitch muscle fibers? 

• They contain large amounts of Mitochondria
• They are fast to fatigue
• They are recruited last
• They contain low numbers of Mitochondria

Multiple Choice

About how many muscles do you have in your body?

• 600

• 50

• 1,000

• 100

Multiple Choice

Contractile unit of a muscle.

• sarcomere

• motor unit

• fascicle

• myofibril

Multiple Choice

Thick filaments are in a myofibril are

• ATPase

• Sarcoplasmic reticulum

• Actin

• Myosin

Multiple Choice

Thin filaments in a myofibril are

• Sarcomeres

• Sarcoplasm

• Actin

• Myosin

Multiple Choice

The energy needed to perform a muscle contraction comes directly from

• ATP

• Oxygen

• Glucose

• Calcium

Multiple Choice

What are the characteristics of fast twitch muscle fibres?

• Explosive activities, fatigue slowly
• Endurance activities, fatigue slowly
• Explosive activities, fatigue quickly
• Endurance activities, fatigue quickly

Multiple Choice

What would the predominant muscle fibre type be for this athlete?

• Slow Twitch
• Fast Twitch A
• Fast Twitch B
• Combination of Fast A and Fast B