7th Class
Science
Respiration in Organisms
Question Bank
Respiration In Plants And Animals
question_answer
DIRECTIONS: Read the passage (s) given below and answer the questions that follow. Passage - 2 We obtain energy by aerobic respiration. But anaerobic respiration can sometimes take place in our muscles during vigorous physical exercise when oxygen gets used up faster in the muscle cells than can be supplied by the blood. The accumulation of_____ in the muscles causes muscle cramps