Q.Select the correct biological term.
Cardiac muscle, atria, tricuspid systole, auricles, arteries, diastole, ventricles, bicuspid valve, pulmonary artery, cardiac cycle, semi lunar valve, veins, pulmonary vein, capillaries, vena cava, aorta.
a. The main artery of the blood.
b. Valves between the left atrium and ventricle.
c. Technical name for relaxation of the heart.
d. Another name for atria.
e. The main vein.
f. Vessels which carry blood away from the heart.
g. Two names for the upper chambers of the heart.
h. Thick walled chambers of the heart.
i. Carries blood from the heart to the lungs.
j. Takes about 0.8 sec to complete.
k. Valves situated at the point where blood flows out of the heart.
l. Vessels which carry blood towards the heart.
m. Carries blood from the lungs to the heart.
n. The two lower chambers of the heart.
o. Prevent blood from re entering the ventricles after entering the aorta.
p. Technical name for one heart beat.
q. Valves between right atrium and ventricles.
r. Technical name for contraction of the heart.
s. Very narrow blood vessels.

Step 1. Vessel-identity clues. (a) 'The main artery of the blood' is the aorta, the single largest artery, carrying blood away from the left ventricle. (e) 'The main vein' is the vena cava (superior and inferior), the largest veins, draining into the right atrium. (f) 'Vessels which carry blood away from the heart' is arteries, by definition. (l) 'Vessels which carry blood towards the heart' is veins, by definition. (s) 'Very narrow blood vessels' is capillaries, the thinnest vessels of all. (i) 'Carries blood from the heart to the lungs' is the pulmonary artery - the one artery that, unusually, carries deoxygenated blood. (m) 'Carries blood from the lungs to the heart' is the pulmonary vein - the one vein that, unusually, carries oxygenated blood.

Step 2. Chamber clues. (d) 'Another name for atria' is auricles, the synonym the chapter uses interchangeably with atria. (g) 'Two names for the upper chambers of the heart' is answered by BOTH atria and auricles together, since these are the two accepted names for the same chambers. (h) 'Thick walled chambers of the heart' and (n) 'The two lower chambers of the heart' both describe the ventricles.

Step 3. Valve clues. (b) 'Valves between the left atrium and ventricle' is the bicuspid valve (the mitral valve). (q) 'Valves between right atrium and ventricles' is the tricuspid valve. (k) 'Valves situated at the point where blood flows out of the heart' and (o) 'Prevent blood from re entering the ventricles after entering the aorta' both describe the semi lunar valve. …

Match each lettered clue's specific wording to the one word-bank term whose known structure, location or timing fits it best, allowing terms to be reused across clues …

• Reading the printed 'tricuspid systole' as a single unfamiliar term instead of recognising it as two separate bank words (tricuspid valve, systole) run together. …