| A. | Nodal tissue |
| B. | A special neural centre in the medulla oblongata |
| C. | Adrenal medullary hormones |
| D. | Adrenal cortical hormones |
| 1. | A, C and D only |
| 2. | A, B and D only |
| 3. | A, B and C only |
| 4. | A, B C and D |
Which of the following is associated with a decrease in cardiac output?
1. Sympathetic nerves
2. Parasympathetic neural signals
3. Pneumotaxic center
4. Adrenal medullary hormones