(b) Which letter, A, B, C or D, shows where oxygen enters the blood? (1) (c) When oxygen enters the blood it combines with haemoglobin. Draw a ring around the correct word or phrase to complete each sentence. plasma (i) Haemoglobin is found in the red blood cells . white blood cells 1) plasma (ii) Most of the carbon dioxide is carried by the red blood cells . white blood cells 1)(Total 5 marks) Q6. The diagram represents the human blood circulation system. (a) and are blood vessels. A, B, C D (i) Give the letter of one blood vessel that is an artery. .................................... (1) (ii) Give the letter of one blood vessel that is a vein. .................................... (1) (b) A student pedalled an exercise cycle at constant speed for 5 minutes. The heart rate student’s was recorded at one-minute intervals during the exercise. The results are shown in the graph. (i) What was the heart rate before the exercise began? student’s ................................................ per minute (1) (ii) How long was it before the heart rate reached 124 beats per minute? student’s
(b) Which letter, A, B, C or D, shows where oxygen enters the blood? (1) (c) When oxygen enters the blood it combines with haemoglobin. Draw a ring around the correct word or phrase to complete each sentence. (i) Haemoglobin is found in the plasma red blood cells white blood cells . 1) (ii) Most of the carbon dioxide is carried by the plasma red blood cells white blood cells . 1)(Total 5 marks) Q6. The diagram represents the human blood circulation system. (a) A, B, C and D are blood vessels. (i) Give the letter of one blood vessel that is an artery. .................................... (1) (ii) Give the letter of one blood vessel that is a vein. .................................... (1) (b) A student pedalled an exercise cycle at constant speed for 5 minutes. The student’s heart rate was recorded at one-minute intervals during the exercise. The results are shown in the graph. (i) What was the student’s heart rate before the exercise began? ................................................ per minute (1) (ii) How long was it before the student’s heart rate reached 124 beats per minute?
heart-revision-ppqs-and-answers.docx