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There are major differences in the metabolism of morphine and the illegal drug heroin. Morphine mostly produces its CNS effects through m-receptors, and at k- and d-receptors. Heroin has a slight affinity for opiate receptors. Most of its actions are due to metabolism to active metabolites (6-acetylmorphine, morphine, and morphine-6-glucuronide).

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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.

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A headache when you wake up in the morning is indicative of sinusitis. Other symptoms of sinusitis can include fever, weakness, tiredness, a cough that may be more severe at night, and a runny nose or nasal congestion.

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There used to be a metric calendar, as well as metric clocks. The metric calendar, or "French Republican Calendar" divided the year into 12 months, but each month was divided into three 10-day weeks. Each day had 10 decimal hours. Each hour had 100 decimal minutes. Due to lack of popularity, the metric clocks and calendars were ended in 1795, three years after they had been first marketed.

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Asthma cases in Americans are about 75% higher today than they were in 1980.

The biconcave disk shape of erythrocytes (red blood cells). The biconcave disk shape of erythrocytes (red blood cells).
Formed elements of blood: erythrocytes, leukocytes (neutrophils, eosinophils, basophils, lymphocytes Formed elements of blood: erythrocytes, leukocytes (neutrophils, eosinophils, basophils, lymphocytes
Erythrocytes contain large amounts of the oxygen-transporting protein Erythrocytes contain large amounts of the oxygen-transporting protein
Erythrocytes. Erythrocytes.
Microcytic, hypochromic erythrocytes. Microcytic, hypochromic erythrocytes.
Erythrocytes in sickle-cell disease Erythrocytes in sickle-cell disease
Video: Frequency of stimulation and force (Recruitment of motor units and force)

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