Question

how respiratory and digestive surfaces are designed for efficient working​

Answer 1

Explanation:

DIGESTIVE SYSTEM : SMALL INTESTINE

Small intestine has small finger like projections on it called VILLI they are thin layered and are richly supplied with blood capillaries. It being folded it increases SURFACE AREA which increases the ABSORPTION and blood capillaries and thin membrane simplifies DIFFUSION of food

RESPIRATORY SYSTEM :LUNGS

In lungs we have BRONCHIOLES and to them we have ballon like sacs called ALVEOLI. Alveoli is richly supplied with blood cappillaries which simplifies the DIFFUSION air.