III. WHAT SYSTEMS ARE THESE ACTIVITIES RELATED?. ANSWER NERVOUS, ENDOCRINE MALE REPRODUCTIVE OR FEMALE REPRODUCTIVE. 1. The egg attaches to the uterus and continues to grow inside the womb. 2. Adrenaline stimulates heart rate and breathing during emergency. 3. Blood sugar level is regulated by insulin and glucagon. 4. A response is a reaction from a brain signal. 5. The ovary secretes oestrogen to facilitate sex characteristics. 6. Sperm cells are supplied by with fluids by the seminal vesicle, prostate and bulbourethral glands.