1: Homeostasis Flashcards
What is physiology?
The study of normal human body function and mechanisms of control
What is tissue?
A group of cells with similar structure and specialised function
What is an organ?
Two or more tissues working together to serve a particular function
The stomach is an organ. Name some different types of tissue and their function.
Epithelial tissue - protection, secretion, absorption
Connective tissue - structure
Muscle tissue - movement
Nervous tissue - communication, coordination, control
What is a body system?
A group of organs which work together to achieve a common goal
To remain healthy, our bodies must maintain ___ physiological conditions.
optimum
What word is used to describe a stable internal environment?
Homeostasis
Give an example of a variable which must be maintained within a narrow range within the body.
Includes:
pH
Blood glucose concentration
Temperature
Water concentration
Ion concentrations…
What are the three main steps of homeostasis?
SENSE deviation from normal
INTEGRATE information with other relevant information
ADJUST variable back to optimum value
What are the two classes of homeostatic control mechanism?
Intrinsic controls
Extrinsic controls
What are intrinsic controls?
Local controls found WITHIN an organ
What are extrinsic controls?
Controls found outside an organ (e.g nervous or endocrine)
a) Controls found outside an organ
b) Controls found within an organ
Match these two definitions to intrinsic and extrinsic controls.
Intrinsic - b
Extrinsic - a
What are two body systems responsible for extrinsic control mechanisms?
Nervous system
Endocrine system
What is a feedforward control system?
A system which produces a response in anticipation of change
