No you head does not expand this is not physically possible. It may feel like it because of all the blood ruhsing through you body and your heart beating so fast. When you sweat alot this is to cool down you body. There is no way your head could expand because of your heart beating faster and sweating.
It is a muscle and it is one of the strongest. Inside of the heart blood is transferred to either lung to get oxygen in exchange for CO2. The heart is basically the center of the circulatory system. All blood goes through it. All four chambers either contract or expand to flow the blood (both atria contract/expand at the same time, and both ventricles contract/expand at the same time)
Excessive body mass puts extra stress on the heart and can reduce the life expectancy of mammals. For humans a proper diet and exercise will expand their life expectancy.
imagine how you usually breathe..... ....do that, only slower.
Spicy foods effect your heart rate because if you try a spicy foods the chemicals can, if hot enough, burn your mouth or hurt it causing pain which Accelerates your heart rate therefore increasing your pulse.
there should never be air around your heart. Air should be contained in the lungs. IF you have air in the chest cavity that is outside the lung, you have a pneumothorax and need to see a dr immediately! The causes of a pneumothorax (air around the heart or lungs) is typically from trauma, such as a puncture wound (knife especially) or gunshot. If you have a pneumothorax or a pneumo-mediasteinum, you may find itr difficult to breath and that you heart rate may increase due to the increased pressure on both your heart and lungs. Air can be removed using a special syringe, allowing the lungs to expand normally and reducing the pressure on the heart. If you have these symptoms you should go to the emergency room immediately
It contains caffeine that accelerates the heart rate.
The heart can expand.
A lot of agents can affect heart rate, but let's say... Cocaine (accelerates the heart rate) Adrenaline (accelerates the heart rate) Potassium chloride (reduces it to zero - this is the chemical they use in executions to make the heart stop)
It will bleed more profusely and it will pulse out as the arteries are coming from the heart
If you cut any artery, blood will spurt out profusely. The heart pumps blood through the body under pressure.
heart attack
Your heart accelerates and your blood preasure rises.
It's not a stimulant, it's a perturbator. Your heart rate accelerates but your movements slow down.
The heart beats accelerates because your organs need more oxygen and the heart pumps the oxygen into the blood and when you need more oxygen than normal your heart rate is faster than normal.
I could -- if I'm appreciated and thanked profusely. Wolfgang Schwartschild -- leave a message on my message board if you're really interested and with specs.
acetylcholine
It is a muscle and it is one of the strongest. Inside of the heart blood is transferred to either lung to get oxygen in exchange for CO2. The heart is basically the center of the circulatory system. All blood goes through it. All four chambers either contract or expand to flow the blood (both atria contract/expand at the same time, and both ventricles contract/expand at the same time)