Late at night, Allan was driving back home from a sport event with his friend, Martin, as a passenger. Unfortunately, Allan could not negotiate one of the turns on the road and drove his car into a nearby wall at a speed of 45 km/h.

Martin, who was not wearing his seatbelt, was ejected from the car and landed violently on a nearby fence. An MRI test confirmed that, as the result of the impact, he suffered left hemitransection of his spinal cord at the thoracic 10^th (T₁₀) level. Allan, who was wearing his seatbelt, had no serious injury.

(Q1) Indicate which (if any) receptors were strongly active in Martin's body during and right after the accident. In the last column, briefly justify your answer. Simple Yes/No answer without justification will not be marked. 

Organ system/receptor in Allan's body Strongly activated (Yes/No) Brief justification

1.Testosterone receptors expressed by skeletal muscle cells

2.Acetylcholine receptors in autonomic ganglia

3. Nicotinic acetylcholine receptors on sweat glands

4. β adrenergic receptors on cardiac myocytes

5. Muscarinic receptors expressed by smooth muscle cells of the small intestines