Where does gas exchange occur in mammals?, Bronchi, Bronchioles, Alveoli, Trachea, Which gas diffuses into the blood at the alveoli?, Carbon dioxide, Nitrogen, Oxygen, Hydrogen, What protein carries oxygen in red blood cells?, Plasma, Enzyme, Myoglobin, Haemoglobin, What happens to breathing rate during exercise?, It decreases, It stays the same, It stops, It increases, Where does anaerobic respiration occur?, Cytoplasm, Mitochondria, Nucleus, Ribcage, What waste product causes muscle fatigue?, Carbon dioxide, Lactic acid, Glucose, Oxygen, Which system transports oxygen around the body?, Digestive system, Nervous system, Circulatory system, Respiratory system, What controls chest volume during breathing?, Lungs, Diaphragm, Heart, Bronchi, What process moves gases from high to low concentration?, Active transport, Osmosis, Diffusion, Filtration, What happens to heart rate during activity?, It stops, It decreases, It increases, It becomes irregular.

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