The Muscular System

How many muscles a human being typically has?

• about 400

• about 500

• about 600

• over 600

The Muscular System is made up of three muscle types:

• Skeleton, Cardiac, Vessel muscles

• Skeleton, Smooth, Vessel muscles

• Skeleton, Cardiac, Smooth muscles

• Skeleton, smooth, autonomous muscles

All muscles have fibers that bundle tightly together. The fibers are:

• The muscle filaments

• The muscle cells

• The muscle ligaments

• The muscle parts

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NGSS.MS-LS1-3

NGSS.MS-LS1-1

NGSS.MS-LS1-2

One of the properties of the muscles is contraction. How does it happen?

• they contract after receiving nervous signals from the nervous system

• they contract after receiving signals from the skeletal bones

• they contract after receiving signals from the autonomous system

• they contract after receiving signals from the smooth muscles

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NGSS.MS-LS1-3

One of the properties of the muscles is extensible, which means... (choose ALL that apply)

• they can be stretched as their fibers can change their length

• they can be stretched without damage by the application of a force

• they stretch after receiving signals from the nervous system

• the smooth muscles can stretch as they are smooth

Skeleton muscles (answer ALL that apply):

• can be extended and contracted

• usually work in pairs, while one contracts the other extends and vice-versa

• are mainly made of slow switch muscles

• are usually used to endure

We can make our muscles enlarge, become bigger by...

• exercising them with increased work

• eating more protein

• stretching them regularly

Abduction is

• moving the muscles towards the body mid-line

• moving the muscles away from the body

• stretching the muscles

• contracting the muscles

Voluntary muscles. It is correct that (ALL that apply)

• they need our conscious effort or decisions to make them move

• they don't need our conscious effort or decisions to make them move

• all skeleton muscles are voluntary muscles

• all muscles are voluntary muscles

Digestion is directly related to: (ALL that apply)

• the voluntary muscles

• the involuntary muscles

• the Smooth muscles

• skeleton muscles