True or false: drowsiness affects your senses, especially your sense of smell.

The right answer is False (its the vision).

Drowsiness is a symptom that results in a strong desire to sleep. It is normal, "physiological", when it occurs in the evening or at the usual bedtime, or in the early hours of the afternoon. If it occurs during the day, we talk about daytime sleepiness. While drowsiness can affect everyone, especially when tired, after a bad night or just after a big meal, it becomes abnormal when it is repeated daily, alters attention and interferes with daily activities.

Signs of sleepiness are:

• tiredness, want to sleep, feeling weak

• vertigo (head that "turns")

• vision disorders (blurred vision, poor appreciation of distances, difficulties to see when night falls ...)

both anaerobic and aerobic respiration use glucose (or other carbohydrates), proteins and lipids to produce atp and nadh. cell uses those energy molecules, obtained from food and   breaks them down during the chemical reactions of respiration. in anaerobic respiration, nadh is regenerated to nad+ by enzymes lactate dehydrogenase (lactate is produced, e.g. in muscle cells) or by alcohol dehydrogenase where ethanol is produced (alcohol fermentation), while in aerobic respiration, electrons from nadh are deposited in the mitochondria to regenerate nad+ (electron transport chain. anaerobic respiration produces 2 atp per molecule of glucose compared to aerobic respiration where about 38 atp molecules are produced.