A heart attack is caused when the heart muscle cells do not get enough oxygen, causing the cells to die. Many people who survive a heart attack get out of breath easily when they exercise gently. Explain why heart attack survivors get out of breath easily. (4)
● Heart (muscle) cannot contract / pump as effectively / powerfully
● So less blood pumped out of heart / to body
● So less oxygen (reaches cells / body) for (aerobic) respiration
● So breathing rate increases to supply more oxygen