Chapter 4: Body Structure Flashcards
chromatin
structural component of the nucleus, composed of nucleic acids and proteins
chromosome
threadlike structures within the nucleus composed of deoxyribonucleic acid (DNA) molecule that carries hereditary information encoded in genes
cytoplasm
jellylike substance found within the cell membrane composed of proteins, salts, water, dissolved gases, and nutrients
deoxyribonucleic acid (DNA)
molecule that holds genetic information capable of replicating and producing an exact copy whenever the cell divides
diaphragm
muscular wall that divides the thoracic cavity from the abdominopelvic cavity
metabolism
sum of all physical and chemical changes that take place in a cell or an organism
organelle
cellular structure that provides a specialized function, such as the nucleus (reproduction), ribosomes (protein synthesis), golgi apparatus (removal of material from the cell), and lysosomes (digestion)
pathology
study of the nature of diseases, their causes, development, and consequences
peristalsis
rhythmic contraction and relaxation of the walls of a tubular organ to propel its contents onward
cytology
the study of the body at the cellular level
histology
the study of tissues
epithelial tissues
covers surfaces of organs, lines cavities and canals, forms tubes and ducts, provides the secreting portions of glands, and makes up the epidermis of the skin. It is composed of cells arranged in a continuous sheet consisting of one or more layers
connective tissue
supports and connects other tissues and organs. It is made up of diverse cell types, including fibroblasts, fat cells, 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
midsagittal (median)
right and left halves
coronal (frontal)
anterior (ventral) and posterior (dorsal) aspects
transverse (horizontal)
superior (upper) and inferior (lower) aspects
anatomical position
a body posture used to locate anatomical parts in relation to each other
dorsal (body cavity)
posterior; includes the cranial and spinal cavities
ventral (body cavity)
anterior; includes the thoracic and abdominopelvic cavities
abdominopelvic divisions
Holds the organs of digestion (abdominal area) and the organs of reproduction and excretion (pelvic area). Divided by two anatomical methods: quadrants and regions.
quadrants
four divisions of the lower torso used to show topographical location
spinal divisions
cervical (neck) thoracic (chest) lumbar (loin) sacral (lower back) coccyx (tailbone)