Mrs aguirre A Ch 1Les 3

Ms aguirreA Ch 1Les 3Bones- are living organs made of connective tissues

the tissues include an outer protective membrane, a layer of hard material and a soft center containing bone marrow

Bone marrow is connective tissue that produces red blood cells and white blood cells

Your body contains several kinds of bones

Bones meet at the joints where they are attached to each other and to muscles.

Different types of joints allow for different types of movement.

Back and forth, circular, or skull has immovable

Skeletal system

This skeleton provides support to your body

Skull protects the brain

Muscles attach to bones by tendons

Tendons are tough bands of connective tissue

Bones are attached to each other by ligaments

they are bands of connective tissue that hold the skeleton togetherHuman bodies have 206 bones

27 bones 26 bonesHuman skull bones = 23 bones

Skeleton is also made of cartilage

Ears and tips of nose made of thisMuscular system

Three kinds of muscles

Voluntary, smooth and cardiac

Voluntary- moves bones and hold skeleton upright

Smooth- contract slowly and move substances through the organs

Cardiac- make up the walls of the heartNervous systemAllows you to experience things and react to your environment.

The central nervous system

Made up of the brain and spinal cord (as thick as a pencil)

Peripheral nervous system

Consists of sensory organs, such as the eyes, ears and body nerves.

Nerves are bundles of nerve cells or neurons (specialized cell that can receive signals and transmit them to other neuronsReceptors are nerve cells that detect conditions in the bodys environment

Sound wavesHeat and cold pressure

Mouth-taste and eyes color and light

Reflexes- automatic responses to situations