Pubertal development also affects circulatory and respiratory systems as an adolescents' heart and lungs <answer>increase in both size and capacity</answer>. These changes lead to increased strength and tolerance for exercise. Sex differences are apparent as males tend to develop "larger hearts and lungs, higher systolic blood pressure, a lower resting heart rate, a greater capacity for carrying oxygen to the blood, a greater power for neutralizing the chemical products of muscular exercise, higher blood hemoglobin and more red blood cells".
How do a person's heart and lungs change during puberty?
increase in both size and capacity