The human body produces and destroys 15 million blood cells every second.
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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Although not all of the following muscle groups are commonly used, intramuscular injections may be given into the abdominals, biceps, calves, deltoids, gluteals, laterals, pectorals, quadriceps, trapezoids, and triceps.
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Everyone has one nostril that is larger than the other.
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The longest a person has survived after a heart transplant is 24 years.
The bicarbonate buffer system
The autonomic nervous system with its sympathetic and parasympathetic divisions
Solar System
Components of the lymphatic system.
Effects of Sympathetic and Parasympathetic Divisions of the ANS
Effects of Sympathetic and Parasympathetic Divisions of the ANS