In which part of the respiratory system, gaseous exchange takes place? A. Alveoli B. Trachea C. Pharynx D. Larynx 2. Which of the following is called as voice box? A. Esophagus B. Diaphragm C. Alveoli D. Larynx 3. Pacemaker is the- A. AV node, B. SA node, C. Bundle of HIS, D.Ventricle muscles. 4. Which of the following gas is released out during the process of respiration? A. Oxygen B. Hydrogen C. Carbon dioxide D. None of the above. 5. The testosterone secretion is controlled by: A. FSH B. LH C. corticoadrenal D. The negative feedback of posterior pituitary E. By negative feedback of anterior pituitary 6. time required for 1 heart beat A. 8 sec B. 0.8 sec C. 1 sec D. 0.5 sec 7. The main hero of male reproductive system A.ovary B. Testes C. Penis D. All 8. The muscle responsible for the cremaster reflex: ………………….. 9. Write the any two function of prostate glands 10. The sex hormone which help in muscles building​