Chapter 4- Body Structure Flashcards
Five levels of Organization
- cells
- tissues
- organs
- systems
- organism
3 main structures:
- cell membrane
- cytoplasm
- nucleus
cell membrane
acts as a barrier that supports and protects the intracellular contents
cytoplasm
jellylike matrix of proteins, salts, water, dissolved gases, and nutrients (located within the cell membrane)
organelles
inside the cytoplasm and are specialized structures
Epithelial tissue
covers surfaces of organs, line cavities and canals, forms tubes and ducts, provides the secreting portions of glands and makes up the outer layer (epidermis) of the skin
Connective tissue
supports and connects other body tissues, there are various types: cartilage, adipose (fat) bone, elastic fiber, and blood
Muscle tissue
provides the contractile tissue of the body, which is responsible for movement
Nervous tissue
transmits electrical impulses as it relays information throughout the entire body
histology
study of tissues
chromatin
forms chromosomes
chromosomes
carry thousands of genes that make u our genetic blueprint
organs
body structures that perform specialized functions; composed of two or more tissue types (ex: stomach contains all 4 types)
system:
composed of varying number of organs and accessory structures that have similar or related functions
Gastrointestinal system includes
esophagus, stomach, small intestine, colon; accessory organs: liver, gallbladder, pancreas
organism
highest level of organization
anatomical position
person stand erect, facing forward, arms at side of the body with palms of hands turned forward with feet parallel to each other
plane
an imaginary flat surface that divides the body into two sections
coronal (frontal)
divides the body into an anterior and posterior section
transverse (horizontal)
divides the body into top and bottom sections
midsagittal plane
runs through the center of the body into right and left halves
abduction
movement away front the midsagittal (median) plane of the body or one of its parts
adduction
movement toward the midsagittal (median) plane of the body
medial
pertaining to the midline of the body or structure