Organising animals Flashcards
Name the four main components of blood.
Red blood cells, white blood cells, plasma, platelets
Why is the human circulatory system a double circulatory system?
Blood passes through the heart twice for every circuit around the body- deoxygenated blood is pumped from the right side of the heart to the lungs, and oxygenated blood that returns is pumped from the left side of the heart to the body
What is the function of platelets?
form blood clots- prevents the loss of blood and stops wounds becoming infected
How does the structure of an artery relate to its function?
Carries blood away from the heart under high pressure- has a small lumen and thick elasticated walls that can stretch
How does the structure of an vein relate to its function?
carries blood back to the heart at low pressure- has valves to prevent blood flowing the wrong way
How does the structure of a capillary relate to its function?
carries blood to cells and tissues- has a one-cell-thick wall to provide a short diffusion distance
List the structure air passes through when breathing in
mouth/nose - trachea - bronchi - bronchioles - alveoli
What is the function of red blood cells?
Bind to oxygen and transports it around the body
What is the function of white blood cells?
Defends the body against pathogens
What is the function of the plasma?
Transports blood cells and substances around the body
