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) that carries hereditary information encoded in genes.
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 f all physical and chemical changes that tak 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
3 main parts of a cell
membrane, cytoplasm, and the nucleus
study of the body at the cellular level is called
cytlogy
Inside the cytoplasm are specialized structures called
organelles
organelles perform specific functions of the cell such as
reproduction and movement
the largest cell organelle is the
nucleus
the nucleus direct the cells
activities and contains chromosomes
the nucleus is responsible for
metabolism, growth & reproduction. it also carries the genetic blueprint of the organism.
The nucleus blueprint is found in a complex molecule called
deoxyribonucleic acid (DNA)
deoxyribonucleic acid (DNA) is organized into a threadlike structure called
chromatin
when the cell is ready to divide, chromatin forms
chromosomes
Groups of cells that perform a specialized activity are called
tissues
the study of tissues is called
histology
More than 200 cell types compose four major tissues of the body
Epithelial, Connective Muscle & Nervous
Epithelial tissue
cover surfaces of organs, lines cavities and canal, forms tubes and ducts provides the secreting portions of glands, and makes up the epidermis of the skin. It is composed of ells 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