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Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.

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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.

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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.

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Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.

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Common abbreviations that cause medication errors include U (unit), mg (milligram), QD (every day), SC (subcutaneous), TIW (three times per week), D/C (discharge or discontinue), HS (at bedtime or "hours of sleep"), cc (cubic centimeters), and AU (each ear).

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Transport Across Membranes Transport Across Membranes
Transport of ammonia to the liver for urea synthesis Transport of ammonia to the liver for urea synthesis
An electron is accelerated from rest through a potential difference of 3750 V. It enters a ... An electron is accelerated from rest through a potential difference of 3750 V. It enters a ...
Electron micrograph of mitochondrial DNA derived from the frog Xenopus laevis Electron micrograph of mitochondrial DNA derived from the frog Xenopus laevis
Main mechanism of carbon dioxide transport and exchange. A lesser amount of CO2 travels to the lungs Main mechanism of carbon dioxide transport and exchange. A lesser amount of CO2 travels to the lungs
Video: Types of Burns

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