What is the function of the oesophagus?
carries food to the stomach
stops food getting into the lungs when you swallow
How is the alveoli adapted for gas exchange?
It has fix walls so it doesn't lose its shape, it is protected.
It has a large surface area and short diffusion distances between the air and the blood.
During inhalation: the diaphragm muscles relax and the internal intercostal muscles contract
What is Vitamin A's role in the body?
sticks together cells lining surfaces in the body, eg. mouth
makes chemicals in retina, protects surface of eye and connective tissue
Where is lipase found in the body?
Pancreas
Stomach
The blood has four main components: white blood cells, red blood cells, capillaries, plasma
Systemic circulation is when:
The heart pumps blood to the lungs to pick up oxygen
The oxygenation blood flows to the heart and is then pumped around the body
What is the role of plasma?
Helps clot the blood
Transports dissolved food molecules, carbon dioxide, urea and all the blood cells
Sensory neurons carry information from sense organs to the central nervous system (CNS)
Which is the correct series of events?
stimulus ----> receptor ----> coordination -----> effector -----> response
stimulus -----> effector -----> coordination -----> response
