Human body
organ
tissue
cells
organ system
most basic unit of sturcture and functions in the body
cell specialization: when cells have a specific job or role in the human body
cell differentiation: the process of becoming specialized
Stem cells: cells that can give rise to different, specialized cells
All cells start off as stem cells which develop into all varieties of cells in the body
Totipotent stem cells: can become any type of cell in the body and potentially develop into an entire system
Tissue: a group of connected cells that have a similar function
Connective tissue: cells that form the body structure (bone and cartilage, blood)
Epithelial tissue: lining of the inner and outer body surfaces (skin, lining of digestive tracts, protection, secretes substances (hormones), absorbs (nutrients)
Muscle tissue: cells that can contract (allows for movement, smooth, cardiac, skeletal)
nervous tissue: Neurons (nerve cells) that carry electrical signals (brain, spinal cord, nerves)
2 or more types of tissue doing the same job
Kidneys, heart, skin, lung
Group of organs that work together to carry out complex functions
All body systems work together to keep the body functioning
skeletal: structure and support - bones
muscular: cells contract for movement
Digestive: break down food and get nutrients to cells
respiratory: exchange o2 and co2
nervous: controles body activites through nerves
circulatoryL deliver gases and nutrients to cells via bloodstream
Lymphatic: help defend against disease
endocrine: hormones, growth and development
Integumentary: protection from outside harm, lining of digestive act
reproductive: produce gametes (sex cells)
Immune: defense against disease/bacteria/virises
excretory: produces urine, sweat, exhaling - all get rid of bodily waste
Homeostasis: maintain a stable internal enviroment