Explanation:
Reflex action is defined as an unconscious and involuntary response of effectors to a stimulus.
Example, on touching a hot object (stimulus), we immediately remove our hand from it.
Hold your breath to find your target heart rate, then be calm until ur heart beat slows until it's the slowest, that's ur resting heart rate
<span>Are at risk as much smokers for respiratory and circulatory diseases.
<span>Passive smokers</span></span>
D) all of the above
All of these are barriers to physical activity
