Definitions Module 3 Flashcards
Exchange surface
A specialised area adapted to make it easier for molecules to cross from one side of the surface to another
Gaseous exchange
The movement of gases by diffusion between an organism and its environment across a barrier eg. the alveoli
Tissue
A group of similar specialised cells working together to perform a common function
Tidal volume
Volume of air moved in and out of the lungs with each breath at rest
Vital capacity
Largest volume of air that can be moved in and out of the lungs in one breath
Residual volume
Volume of air that always remains in the lungs even after biggest possible exhalation
Inspiration reserve volume
The volume of air that can be breathed in above the normal tidal volume
Expiration reserve volume
The volume of air that can be breathed out above he normal tidal volume
Transport
The movement of oxygen, nutrients, hormones, waste and heat around the body
Open circulatory system
Blood does not always remain in vessels
Closed circulatory system
Blood always remains in vessels
Double circulatory system
Blood flows twice through the heart for one circuit of the body. Contains a pulmonary circuit and systemic circuit
Cardiac cycle
The sequence of events in one heart beat
Myogenic
Muscle tissue that generates its own contractions
Fibrillation
The chambers of the heart contracting out of rhythm
