pH Regulation & BuffersATI TEAS 7 cheat sheet

Holding blood at 7.35–7.45

8 key facts 1 practice questions Reviewed Oct 2026

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The Range

Blood pH is held at 7.35–7.45
Below 7.35 is acidosis; above 7.45 is alkalosis

Buffer System

Bicarbonate is the main blood buffer
It soaks up excess H⁺ or releases it as needed

Respiratory Control

Breathing faster blows off CO₂ → pH rises
Breathing slower retains CO₂ → pH falls
Acts in minutes

Renal Control

Kidneys excrete H⁺ and reclaim bicarbonate — slower but more powerful

Key takeaway

Holding blood at 7.35–7.45

Before you read

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Question 1 of 1

Which term describes the maintenance of a stable internal body environment?

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