Understanding Homeostasis in Biology

Which organ in the human body is primarily responsible for regulating blood glucose levels?

• Lungs

• Pancreas

• Kidneys

• Stomach

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NGSS.HS-LS1-3

What is the main purpose of homeostasis in living organisms?

• To increase body temperature

• To maintain a stable internal environment

• To promote rapid growth

• To eliminate all waste products

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NGSS.HS-LS1-3

Which of the following is an example of a negative feedback mechanism in the human body?

• Blood clotting

• Sweating to cool down

• Childbirth contractions

• Blood sugar rising after eating

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Which term describes the process by which organisms keep their internal conditions relatively constant?

• Photosynthesis

• Respiration

• Homeostasis

• Digestion

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NGSS.HS-LS1-3

Which of the following best describes how the body responds when blood temperature rises above normal?

• Blood vessels constrict and shivering begins

• Blood vessels dilate and sweating increases

• Heart rate decreases

• Breathing rate slows down

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NGSS.HS-LS1-3

If a person drinks a large amount of water, which organ system is primarily responsible for restoring water balance?

• Digestive system

• Nervous system

• Excretory system

• Muscular system

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NGSS.HS-LS1-3

Explain how insulin and glucagon work together to maintain blood glucose homeostasis.

• Insulin increases blood glucose, glucagon decreases it

• Both hormones increase blood glucose

• Insulin decreases blood glucose, glucagon increases it

• Both hormones decrease blood glucose

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NGSS.HS-LS1-3

Which of the following scenarios best illustrates a failure of homeostasis?

• Sweating during exercise

• Shivering in cold weather

• Uncontrolled high blood sugar in diabetes

• Increased breathing rate during running

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A student runs a marathon on a hot day and begins to feel dizzy and weak. Using your understanding of homeostasis, explain what might be happening in the student's body and suggest a strategy to restore balance.

• The student is likely experiencing dehydration; drinking water and resting can help restore balance

• The student is experiencing hypothermia; putting on more clothes will help

• The student has low blood sugar; eating salty snacks will help

• The student is overhydrated; avoiding fluids will help

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A person is exposed to cold temperatures for an extended period. Describe the sequence of physiological responses that help maintain their core body temperature.

• Blood vessels dilate, sweating increases, heart rate slows

• Blood vessels constrict, shivering begins, metabolic rate increases

• Blood vessels dilate, shivering stops, metabolic rate decreases

• Blood vessels constrict, sweating increases, heart rate increases

Tags

NGSS.HS-LS1-3