Sixty-year-old Njia says, "I'll prove to you that free radicals can impact the body. Just look at this!" If Njia knows what she is talking about, she will most likely show you

a. a report on high levels of vitamin E in her blood stream.
b. a medical chart indicating excessive levels of oxygen in her lungs.
c. a darkened "age spot" on her arm.
d. a doctor's report indicating the level o the neurotransmitter GABA is extremely high within her brain.

If Njia knows what she is talking about, she will most likely show you a darkened "age spot" on her arm. The correct option is C.

Explanation:

Free radicals are unstable and very reactive molecules which are missing one electron and they can be produced by the body, for example, during respiration. Free radicals can equally begotten from external environment, example, exposure to UV radiation from the sun, toxins and smokes. When these free radicals enter the body skin cells, they combine with the free electron and cause damage to the skin cells. It affects the skin cell membrane,mitochondria and it's DNA. Over a period of time it will cause skin aging which appears as wrinkles and age spots. This can be removed by the use of antioxidant like Vitamin A, C, and E which donated an electron to the free radicals so that the free radicals doesn't have to take the electron from the cells of the skin.

the aorta is the large artery leaving the heart branches into smaller arteries, which eventually branch into capillaries.the arteries carry oxygen and nutrients away from your heart, to your body's tissues. the capillaries are small, thin blood vessels that connect the arteries and the veins. the statement that arteries carry oxygen-rich blood to capillaries is true. veins on the other hand are blood vessels that take oxygen-poor blood back to the heart.