5.1 Identify the independent variable. (1)

3.3 What is the pressure of the blood as it enters the heart? High pressure or low pressure? (1)

1.4 Which one describes the structure of vessels R and S correctly? (1)           R S A Thick, muscular wall Thin, muscular wall B Small lumen Large lumen C Thin, muscular wall Thick, muscular wall D Largest blood vessel Small blood vessel    

Beach dunes will be more resilient to erosion and storms if:

3.4 An average adult’s heart pumps 540 litres of blood in one hour. If an adult’s total blood volume is 6 litres, how many times will this blood have to circulate around the body in an hour? (2)

  QUESTION 3     The graph shows blood pressure in vessels. Study the graph and answer the questions.   Right click on the button to open the diagrams in a new window.    

The trade winds, a prevailing circulation pattern, have the flow of air ____________ the equator due to the ________ of air. 

1.2 Choose the correct order that blood would flow from the arm to the lungs. (1)

A consumer eating  producer represents:

Mechanical types of beach renourishment include: