Circadian Rhythms Quiz

What are circadian rhythms?

• Physical, mental, and behavioral changes that follow a 24-hour day-night cycle

• Chemical substances that stimulate the brain and body

• The internal circadian rhythm of a person

• A disruption of circadian rhythms from long-distance travel

Which part of the brain acts as the 'master clock'?

• Hypothalamus

• Neuron

• Suprachiasmatic nucleus

• Sensory receptor

What is the role of melatonin in sleep?

• Increases when it is dark out and decreases when it is light out

• Stimulates many important processes in the body

• Plays a role in the structure, function, and regulation of the body's tissues and organs

• Transmits information to other nerve, muscle, or gland cells

What is the function of the hypothalamus?

• Produces and releases melatonin

• Controls the clocks throughout the body

• Plays an important role in hormone production

• Reacts to physical stimuli in the environment

What is the purpose of biological clocks?

• To produce circadian rhythms and regulate their timing

• To stimulate the brain and body

• To influence the 24-hour cycle of sleep and activity

• To disrupt circadian rhythms from long-distance travel

What is the effect of caffeine on the brain and body?

• Increases sleepiness and tiredness

• Plays a role in the structure, function, and regulation of the body's tissues and organs

• Stimulates the brain and body, making you feel more awake and alert

• Transmits information to other nerve, muscle, or gland cells

What is the term for an organism's innate timing devices?

• Circadian rhythms

• Chronotype

• Genes

• Biological clocks

What is the term for the 24-hour cycle of sleep and activity influenced by a person's internal circadian rhythm?

• Circadian rhythms

• Chronotype

• Genes

• Biological clocks

What is the term for a disruption of circadian rhythms from long-distance travel?

• Circadian rhythms

• Chronotype

• Jet lag

• Biological clocks

What is the term for a small section of DNA that contains instructions for making a specific protein?

• Circadian rhythms

• Chronotype

• Genes

• Biological clocks