Muscular System

Muscular contraction

Moves one bone at the joint to produce movement.

How much body weight do muscles make up?

Makes up 40 % of your total body weight.

How many Skeletal muscles are there in the human body?

There are approximately 650 Skeletal muscles in the human body.

How can muscles act?

Muscles can only act when it gets a signal from the nervous system.

What are three types of the muscle tissue?

These include the smooth muscle, skeletal muscle and cardiac muscle.

Muscle atrophy

This is defined as a decrease in the mass of the muscle.

What are the three types of muscle contraction?

There are three types of muscle contraction, these are including Concentric contraction (shortening), Eccentric contraction (lengthening) and Isometric contraction (static)

What are the three types of muscle tissue?

These include the smooth muscle, skeletal muscle and cardiac muscle.

Smooth muscle

• Long and spindle shaped
• It’s found in the walls of organs along with hollow cavities
• It serves to propel material along length of cavities. Some examples are urinary and respiratory systems.
• Involuntary. This means that they work without conscious control.

Cardiac muscle

• Heart muscle
• Involuntary (works without conscious control)
• More organized than smooth muscle
• It’s pseudo striated
• Avg heart rate is approx. 65 bpm

Skeletal muscle

• It’s also called striated
• It’s long cylindrical and striped up in appearance
• Makes up form of body, usually attaches to bone via tendons and cross a joint
• Muscular contraction moves one bone at the joint to produce movement
• Characterized by rapid, short term contraction of strength
•Underneath voluntary control

Muscle hypertrophy

involves an increase in size of skeletal muscle through a growth in size of its cells as an result of the increased demand or load placed on the muscle.

What happens to muscles when a load is placed on them?

Muscle can either shrink or grow depending on the load which is placed on the muscle.

What is the function of the muscle?

The function of the muscle is to attach to the bone, when the muscle is activated it contracts. When muscles contracts it brings the bones attached at each end to the muscle together. This is known as a muscular contraction.

What are some muscles that you are responsible for?

Tibialis Anterior

Obliques

Deltoids

Forearms

Gastrocnemius

voluntary muscle

These muscles are controlled by the nervous system.

In voluntary muscle

These muscles are not controlled by the nervous system.

Muscular contraction

When muscles contracts it brings the bones attached at each end to the muscle together.

What are some muscles that are you responsible for?

Pectorals

Abdominals

Triceps

Gluteals

Quadriceps

What are some muscles that are you responsible for?

Sternocleidomastoid

Latissimus Dorsi

Trapezius

Biceps Brachii

Hamstrings

Sartorius