07/12/2025
https://www.facebook.com/100067139978126/posts/1164053289175993/
✅ pH Values of Human Body Fluids
pH is a measure of how acidic or alkaline a substance is. Human body fluids maintain specific pH ranges to support normal physiological functions. Even slight deviations can affect digestion, immunity, enzyme activity, and overall homeostasis.
The infographic lists major body fluids along with their normal pH ranges and biological significance. Below is an expanded and detailed explanation of each.
🔰 1. Saliva (pH 6.2 – 7.6)
Saliva is generally slightly acidic to neutral.
It helps in:
◾ Initial digestion of carbohydrates via salivary amylase
◾ Lubrication of food for swallowing
◾ Protecting oral tissues and maintaining tooth health
🔰 2. Blood (pH 7.35 – 7.45)
Blood is slightly alkaline and one of the most tightly regulated fluids in the body.
◾ Maintains acid-base balance essential for enzyme function
◾ Regulated by lungs, kidneys, and buffer systems
◾ Even minor fluctuations can be life-threatening
🔰 3. Gastric Juice (pH 1.5 – 3.5)
Gastric juice is highly acidic, mainly due to hydrochloric acid (HCl).
◾ Helps break down proteins
◾ Activates pepsin enzyme
◾ Kills harmful microorganisms entering with food
🔰 4. Urine (pH 4.5 – 8.0)
Urine pH is highly variable and reflects diet, hydration, and metabolic status.
◾ Acidic urine may indicate high protein intake or metabolic disorders
◾ Alkaline urine may occur after meals or certain infections
◾ Helps the body remove excess acids/bases
🔰 5. Tears (pH ~7.0)
Tears are generally neutral.
◾ Protect the eyes from irritants
◾ Provide lubrication and nourish corneal tissues
◾ Contain antimicrobial enzymes like lysozyme
🔰 6. Sweat (pH 4.5 – 7.0)
Sweat is usually slightly acidic and varies widely.
◾ Helps regulate body temperature
◾ Mild acidity prevents bacterial growth on the skin
◾ Contributes to skin surface pH balance
🔰 7. Bile (pH 7.6 – 8.8)
Bile is alkaline and produced by the liver, stored in the gallbladder.
◾ Essential for fat digestion and absorption
◾ Neutralizes acidic chyme from the stomach
◾ Helps in waste excretion (bilirubin, cholesterol)
🔰 8. Pancreatic Juice (pH 7.5 – 8.0)
Pancreatic juice is alkaline, rich in bicarbonate.
◾ Neutralizes stomach acid entering the duodenum
◾ Provides the ideal pH for pancreatic enzymes
◾ Facilitates digestion of fats, proteins, and carbohydrates
🔰 9. Cerebrospinal Fluid (pH 7.3 – 7.4)
CSF is slightly alkaline.
◾ Cushions and protects the brain and spinal cord
◾ Maintains a stable chemical environment for neurons
◾ Assists in nutrient transport and waste removal
🔰 10. Vaginal Fluid (pH 3.8 – 4.5)
Vaginal fluid is acidic due to lactic acid production.
◾ Prevents growth of harmful pathogens
◾ Supports healthy microbiome (Lactobacillus species)
◾ pH varies with menstrual cycle, age, and hormonal changes
🔰 11. Semen (pH 7.2 – 8.0)
Semen is slightly alkaline.
◾ Protects s***m from acidic vaginal environment
◾ Enhances s***m motility and survival
◾ Ensures successful fertilization conditions
