b2

• how does the double circulatory system work?

  one pathway carries blood from the heart to the lungs (where gas exchange takes place)

  one pathway carries blood from the heart to the tissues
• where does the blood pumped by the right ventricle go?

  pumps deoxygenated body to lungs
• where does blood pumped by the left ventricle go?

  pumps oxygenated blood to body tissues
• why is the double circulatory system important?

  makes the system more efficient - oxygenated blood can be pumped around the body at a higher pressure by the left ventricle
• what is a tissue?

  a group of similar cells that work together to carry out a particular function
• what is an organ?

  a group of different tissues that work together to peform a certain function
• what is an organ system?

  a group of organs working together to perform a particular function.
• what is the digestive system?

  breaks down and absorbs food
• what do the pancreas and salivary glands produce?

  produce digestive enzymes
• what is the role of liver in the digestive system?

  produces bile (stored in the gallbladder) which emulsifies fat and allows the lipase enzyme to work more efficiently
• what is the role of the large intestine in the digestive system?

  absorbs water from undigested food , producing faeces
• what is the role of the small intestine in the digestive system?

  absorbs soluble food molecules