Question

does smoking increase or decrease levels of hemoglobin?

question 3 (mandatory) (10 points)
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what is a major cause of macrocytosis?

Explanation:

First Question (Does smoking increase or decrease levels of hemoglobin?):

Smoking can lead to an increase in hemoglobin levels. This is because smoking causes hypoxia (low oxygen levels in the blood) as carbon monoxide from smoke binds to hemoglobin, reducing its oxygen - carrying capacity. The body responds to this perceived lack of oxygen by producing more red blood cells (and thus more hemoglobin) to try to compensate for the reduced oxygen delivery.

A major cause of macrocytosis is a deficiency in vitamin B12 or folate. These nutrients are essential for DNA synthesis in red blood cell precursors. When there is a deficiency, the red blood cells produced are larger than normal (macrocytic) as their development is disrupted. Other causes can include alcoholism, liver disease, and certain medications, but vitamin B12/folate deficiency is a primary and common cause.

Answer:

Smoking generally increases levels of hemoglobin.

Second Question (What is a major cause of macrocytosis?):