Muscular System

What type of muscle tissue is found in the heart?

• skeletal

• smooth

• cardiac

• voluntary

Muscles move bones by

• pushing

• pulling

• both pushing and pulling

The elbow bends when

• the biceps muscle contracts

• the triceps muscles contracts

• the biceps muscle relaxes

• the triceps muscle relaxes

Muscles contract when

• thin filaments slide past thin filaments

• thick filaments slide past thick filaments

• thin filaments slide past thick filaments

The thick filament is composed of: 

• Myosin
• Actin

The thin filament is composed of: 

• Myosin
• Actin

Actin myofilaments are

• attached to the z disk

• are found primarily in the h zone

• are thicker than myosin myofilaments

• all of these options

Which area of a sarcomere contains only actin?

• Z disk

• A band

• H zone

• I band

Which part of the sarcomere does not shorten during muscle contraction?

• A band

• H zone

• I band

• None of these

Skeletal muscles...

• Require energy in order to contract

• Require energy in order to relax

• Relax when calcium ions are transported into the sarcoplasmic reticulum

• All of these