Homeostasis And Orgnaisation Of Body Flashcards
What are the different levels of organisation in the human body
Chemical
Cellular
Tissue
Organ
Organ system
Organism
Epithelial cells
Line hollow organs and tightly attached together; transport function and protect
Nerve cells
For rapid communication.
Motor neurons sends signals from brain to muscle and glands to control function
Sensory neurons relay info from bodies internal or external environment to brain
Muscle cells
Specialised for contraction and movement
Examples are skeletal cardiac and smooth muscle
Connective tissue cells
Diverse group of cells. Supports and protects organs by providing structural strength
Organs
Organs contain two or more of these specialised tissues that perform together.
E.g. GIT
Inside of git lined with epithelial tissue and the wall has smooth muscle
Nervous tissue controls muscle contraction and gland secretion and connective tissue binds it all together
Homeostasis
It is the maintenance of a stable internal environment
Factors that affect homeostasis
Concentration of nutrients, o2 and co2, waste products, water and electrolytes
Ph
Volume and pressure
Temperature
Body fluid compartments
Body cells are contained in a watery internal environment where changes are made.
ICF fluid inside all body cells
ECF fluid environment where cells live which contains two compartments plasma and interstitial fluid.
3 homeostatic control systems
Receptor, control centre and effector
Feedback systems
Negative- stimulus that creates a response leading to original stimulus decreasing
Positive- stimulus that creates a response leading to original stimulus increasing
Feedfoward
Response made in anticipation of change
Order of tissues in the GIT
Mucosa
Submucosa
Muscularis Externa
Serosa
