Charper 3 levels of organization Flashcards
levels of organization
Cell, Tissue, Organs, Organ systems, and Organisms
Cells
are the structural unit that forms all body tissues.
*the wal is composed of lipids and proteins to allow substances to exit or enter.
cell structure
cytoplasm, mitichondria, lysosome, centrioles, nucleus, nuclear envelope, rough endoplasmic reticulum, golgiaparatus.
Tissue levels
*gorup of cells found in the body, Epithelial, Connective, Nervous, & muscle
Epithelial Tissue
- Functions as protection, absorption, & seecretion.
- Forms the epidermis (top layer) single layer(simple), Several layers (stratefied)
- shapes- squamous (flat, Cubodial (cube), Columnar (SYlindrical).
Connective Tissue
Cells that form various consistencies to connect & support other body tissues
- cartilage
- edipose
- bone
- blood
Nervous tissue
Composed of cells called Neurones. They transmit nerve impulses by a chemical called neurotransmitters.
- compose the brain
- spinal cord
- nerves of the whole body
- controls muscles, glands, homeostasis, and mental activity.
Muscle tissue
composed of cells called contractile fibers.as muscle cell relaxes or contracts it shorteness or lenghtness
- helps movement
- heart beat
- Organ functions
- maintains blood pressure
Organs
made up of 2 or more tissues that perform specialized functions
organ systems
many organs and structures work together as organ systems
*The heart acts as a pump along with a network of arteries, veins, and capillaries, creating the cardio vascular system.
anatomical position
Pt stands up right with arms at the sides, palms facing forward, legs are straight and toes pointing forward
mid line
- often used as a point of reference
* imaginary line runs from head to feet and through the umbilicus it divides the body into a right and left halves
axial
includes the head, neck and trunk
appendicular
includes the arms (upper extremities), and legs (lower extremities).
directional terms
- from mid line and out = lateral
- outside towards the mid line = medial
- Line up = superior
- line pointing down = inferior
- The elbow is proximal to the shoulder
- The elbow is distal from the wrist
Sagittal plane
Runs vertically from front to back, dividing the body into a left and rigjt halves
frontal plane
- also known as the coronal plane
* runs vertically from left to right, dividing the body into a front and back portions
transverse planes
- also known as the horizontal plane
* Divides the body into a lower and upper portion
elbow extension
hand down
elbow flexion
arm up half way like lifting a weight
shoulder abduction
arm extended at shoulder level