Beta 1 receptors
The neurotransmitter epinephrine can cause the blood pressure to become low. This neurotransmitter also regulated the heart rate. It is often controlled by stress.
heart mediater, it causes rapid increase in heart rate, causes stroke, heart attack etc.
acetylcholine~ACh
beta-one receptor
The neurotransmitter that causes an individual to feel more alert is norepinephrine. It plays a key role in the body's fight-or-flight response, increasing heart rate, blood flow to muscles, and overall alertness.
Fever due to any cause can increase the respiratory rate. Any disease of lungs or heart can increase the heart rate. Severe anemia is another cause.
Anxiety attacks does not cause heart attacks in normal heart. The anxiety may cause heart attack in previously compromised heart. You can have heart attack, if you are a patient of severe angina pectoris.
An increase in the heart rate can be caused by a number of things. One is the increase in the blood coming back from the body to the heart. The increased volume of blood stretches the heart muscles causing a "reflex" increase in heart rate to accommodate the increased need for oxygen such as in the case of exercise. Another one could be the sympathetic control of the brain such as in periods of anxiety, fear or anger. Drugs can also increase your heart rate.
Scary games can increase the heart.
spicy foods increase our heart rate but nothing will slow it down.
Hypothermia initially causes an increase in pulse rate as the body attempts to maintain adequate blood circulation and oxygen delivery to vital organs despite the drop in core temperature. The heart works harder to counteract the effects of cold, which can lead to an increased heart rate. However, as hypothermia progresses, the heart rate may eventually decrease due to impaired cardiac function and metabolic processes.
This is a riddle with the answer being "Love"