MUSCLE SYSTEM

All of the following are functions of skeletal muscle EXCEPT:

• Heart Contractions

• Maintaining body posture

• Producing body heat

• Body movement

The basic unit of contraction in skeletal muscle is labeled #1. It is called

• motor neuron

• sarcomere

• actin

• myosin

The thin myofilament found within a muscle fiber is labeled 3. It is

• motor neuron

• sarcomere

• actin

• myosin

All are true about the sliding filament model EXCEPT

• The Z lines are pulled closer together

• actin and myosin filaments “slide” past each other and the myosin “hooks” onto the actin contracting the muscle

• sarcomeres become smaller and contract

• It requires no energy for the sliding filament theory

The connective tissue that attaches muscle to bone is:

• sarcomere

• ligament

• tendon

• myofilament

Which type of muscle tissue is voluntary?

• Skeletal muscle

• Cardiac muscle

• Smooth muscle

When you work out regularly at the gym, you are increasing muscle fibers.

• True

• False

Tags

NGSS.HS-LS2-3

Structure number 2 is a bundle of muscle fibers and is called

• fascicle

• myofibril

• ligament

• muscle fiber

Tags

NGSS.HS-LS1-2

Structure number 3 is called

• fascicle

• myofibril

• ligament

• muscle fiber

Tags

NGSS.HS-LS1-2

If an injury caused damage to the insertion of the biceps brachii muscle, the injury would be nearest the:

• shoulder

• wrist

• elbow