The sa node <u>spontaneously</u> fires at regular intervals.
<h3>What is SA node?</h3>
SA node; an accronym for sinoatrial node is a mass of specialized issue situated in the heart; specifically in the right upper chamber of the heart.
This sinoatrial node help the heart generates electrical stimulus regularly usually between 60 to 100 times per every minutes
<h3>What is heart?</h3>
The heart is a muscular organ and the only organ in the known which helps to pump blood to various parts of the body
- Helps in the mentenance of blood pressure
- It helps to pump oxygenated blood
- It helps to transfer hormones
- Helps to receive deoxygenated blood as well
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Here are your answers.
C, D, A, A/C , C, C, D, D, D
they belive that becuase when you are completly exposed to the sun that is when you skins pigamentation is then distroied.
Answer: B. DIET
Explanation: The other factors are benefits of exercise. Diet is the only variable that isnt a benefit.
Myopia (i think) sorry if this is wrong
