Identify two features visible on the left side of the heart in Fig. 6.1 and explain how each feature is adapted for the heart’s function.
Cardiac muscle is called myogenic. This means that the electrical activity responsible for a regular heartbeat starts within the heart muscle itself. Describe how electrical activity within the heart controls each heartbeat.
Tissue fluid forms from blood plasma as it moves through capillaries. Fig. 6.2 is a diagram of a capillary and nearby tissue cells in a capillary network. Describe two functions of tissue fluid.
Using Fig. 6.2, describe how tissue fluid is formed.
Measles is a widespread disease caused by a virus. Vaccination to prevent it has been highly effective. A child is given a measles vaccine. Explain why only some of the T-lymphocytes in the child respond to the measles vaccine.
Describe the sequence of events in an immune response to a vaccine that produces lymphocytes responsible for long-term immunity to measles.