Human Body Responses to Cold

The video explores the human body's automatic functions, focusing on shivering as a response to cold. It explains the biological pathways involved, including the role of the brain and hormones like irisin in generating heat. The video also compares shivering to exercise in terms of energy expenditure and concludes with a call for viewer interaction.

What is one of the automatic functions of the human body mentioned in the video?

• Reading a book

• Digesting food

• Voluntary muscle movement

• Writing an essay

Where does the signal from cold receptors in the skin go first?

• To the stomach

• To the lateral parabrachial nucleus

• To the heart

• To the spinal cord

What process causes blood vessels to narrow in response to cold?

• Vasoconstriction

• Vasodilation

• Photosynthesis

• Thermoregulation

What causes the skin to resemble that of a plucked bird?

• Goosebumps

• Sweating

• Vasodilation

• Sunburn

What is the primary function of shivering?

• To relax muscles

• To increase blood flow

• To generate heat

• To cool down the body

What hormone is released by contracting skeletal muscles during shivering?

• Cortisol

• Insulin

• Irisin

• Adrenaline

What type of fat is known for burning energy and generating heat?

• Subcutaneous fat

• Visceral fat

• Brown fat

• White fat

How does irisin affect white fat?

• It dissolves it completely

• It makes it store more energy

• It gives it characteristics of brown fat

• It turns it into muscle

How long does it take for shivering to produce the same amount of irisin as an hour of moderate exercise?

• 10 to 15 minutes

• 5 to 10 minutes

• 20 to 25 minutes

• 30 to 35 minutes

What is the main similarity between shivering and exercise mentioned in the video?

• Both require special equipment

• Both cause sweating

• Both produce irisin

• Both increase heart rate