Digestion lesson ★ 0.000

1. When the man smells something he likes to eat, the gastric juice is poured out in large quantities. 2. We know vitamin B, is widely distribut- ed in nature occurring in most foods. 3. The cells select the amino acids they need and use them to construct new body tissue and such vital substances as antibodies, hormones, enzymes and blood cells. 4. The food we take and the air we breathe often contain poisonous substances and pathogenic microorganisms. 5. Chemical studies have shown vitamin D is ex