Read the given statements regarding changes occurring in organisms during ageing.
Channel: Doubtnut
Date: 2020-05-03

Read the given statements regarding changes occurring in organisms during ageing.  I. Heart rate decreases slightly ageing.  II. The brain loses some cells (neurons) and others become damaged.  III. Enzyme aldolase becomes more effective.  IV. Collagen becomes less permeable, rigid and insoluble.  Which of the following changes occur in human beings?