What does the QRS wave represent in an ECG?
Depolarisation of the ventricles.
Match the following options.
| A. Haemolymph | (i) Immuntiy |
| B. R.B.C. | (ii) Coagulation |
| C. Antibody | (iii) Cockroach |
| D. Antibody | (iv) astr ansport |
| E. systole | (v) Contraction |
How many times does a heart beat per minute?
Name a animal having open circulatory system.
Which is the largest vein?
