The recommended limit of caffeine during pregnancy is 200 milligrams (mg) a day. So with a typical soda containing 35 to 55 mg of caffeine, it's wise to limit yourself accordingly, and take into account other sources of caffeine in your diet, such as coffee, tea, and energy drinks.
If you have a known heart problem, such as heart failure or heart disease, PVCs may be a sign that a dangerous heart rhythm could occur. So if you have a heart problem, talk to your doctor if you feel any change in your heartbeat. The cause of PVCs usually isn't known. But the chance of having PVCs can be increased by: 1  Having too much or too little of certain minerals (electrolytes) in your body. 2  Having too little oxygen in your blood, which could happen if you have COPD or pneumonia. 3  Using some medicines, such as albuterol.
The sympathetic nervous system causes both vasoconstriction & vasodilation. During fight or flight you need more O2/blood delivered to your skeletal muscles. The SNS causes vasodilation in skeletal muscles.he sympathetic nervous system stimulates responses to strong feeling/emotion (as well as having other jobs). So it will cause your heart to beat faster â¦ and other fight or flight reactions in response to such things as terror, hate, lust and so-on.... 1 person found this useful.