Anatomy & Physiology Cell + Cell Cells + Cells Tissue + Tissues Organ + Organs System + Systems Human Body Structural Units
Cells membraneDefinition: - - Is the membrane that encloses the cytoplasm of a cell.Functions: 1-Structural: - Like an egg membrane, it helps the cell maintain its form & separate it from the outside environment. 2- Transportation - Semipermeable, it has a special chemical & physical properties. - It interact with other cells & “decide” what goes in (nutrients) & what goes out (wastes).
Nucleus - Nucleus has DNA & RNA. - DNA & RNA are 2 proteins that carry genetic information. - The nucleus is the Control Center of the cell. - It directs the metabolic activities. - At least one nucleus in each cell. - RBC lose their nucleus as they mature. - Skeletal muscle have more than one nucleus.
Epithelial Tissues * Epithelial tissue make a continuous covering of external (Skin) & internal (GIT) body surfaces. * Functions: 1- Protection2- Secretion 3- Regulate the passage of materials across them.
Epithelial Tissues * In the small intestine it absorbs nutrients. * In glands it secrets digestive enzymes, hormones, mucous & saliva. * Specialized epithelial cells, i.e. have special Functions such as skin color, hair, nails, mucous production & sweat regulation.
Connective Tissue * It is the major structural material of the body. Functions: - Provide support for the body- Connects its organs & tissues.
Connective Tissues * It includes( tendons, cartilage, bone, blood, lymph) functions * Their functions include: - Bind & support other tissues. - Store fat. - Kill bacteria. - Produce blood cells & produce antibodies against infection & diseases