Page 10 - Prueba

8 The muscular system

The relationship between the nervous system and the muscular system
allows us to do many actions such as moving, digesting food, etc.
We have three types of muscles in our bodies:

Smooth muscle lines the digestive Striated muscle is stimulated Cardiac muscle has a similar
tract and is controlled by the by the somatic nervous system. It structure to striated muscle, but it is
autonomic nervous system. It has controls conscious body movements not controlled voluntarily. It forms
the longest-lasting and slowest with quick, voluntary contractions. the heart. The autonomic nervous
involuntary contractions. Its fibres or cells are elongated. system controls heartbeat.

Frontalis
MUSCULAR CONTRACTION
Temporalis Occipitalis

Masseter Sternocleidomastoid
Trapezius

Pectoralis major Deltoid

Triceps
Biceps

Skeletal muscles work in antagonist Serratus anterior
pairs around joints. When a nerve Rectus
impulse tells a muscle to contract, its abdominus
antagonistic partner relaxes.
External oblique

Flexors and
extensors
MUSCULAR STRUCTURE

Adductor
longus
Gluteus maximus

Rectus femoris

Sartorius
Biceps femoris

Adductor magnus
Muscle fibres are grouped together in
bundles.
Gastrocnemius

Flexors and
extensors

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