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What is the main function of the nervous system?

A. To produce hormones that regulate body functions

B. To send signals throughout the body to control actions and responses

C. To filter toxins from the bloodstream

D. To regulate the production of red blood cells

Answer: B. To send signals throughout the body to control actions and responses

Which level of organization is directly made up of cells working together?

A. Tissue

B. Organ

C. Organ system

D. Organism

Answer: A. Tissue

6. Which level of organization includes all the other levels working together to keep a human alive?

A. Organ system

B. Organ

C. Cell

D. Organism

Answer: D. Organism

Which of the following best explains how the nervous system helps maintain homeostasis?

A. It works with the endocrine system to help regulate blood sugar levels.

B. It helps monitor and filter certain substances from the blood.

C. It detects internal and external changes and coordinates responses.

D. It controls muscle movements involved in digestion and energy use.

Answer: C. It detects internal and external changes and coordinates responses.

Which of the following best explains how the nervous system helps maintain homeostasis?

A. It works with the endocrine system to help regulate blood sugar levels.

B. It helps monitor and filter certain substances from the blood.

C. It detects internal and external changes and coordinates responses.

D. It controls muscle movements involved in digestion and energy use.

Answer: C. It detects internal and external changes and coordinates responses.

A scientist creates a robot that mimics how humans respond to their environment. Which part of the robot would be most like the human nervous system?

A. The wheels

B. The wires and control system

C. The batteries

D. The metal shell

Answer: B. The wires and control system

What is the main function of the reproductive system?

A. It works with other systems to protect the body from disease.

B. It contributes to the continuation of the species through reproduction.

C. It supports the transport of essential substances within the body.

D. It helps process materials needed for growth and energy.

Answer: B. It contributes to the continuation of the species through reproduction.

What are hormones?

A. Proteins that help control body movement.

B. Specialized cells that support blood production.

C. Chemical messengers that help regulate body functions.

D. Signals that travel quickly to coordinate body responses.

Answer: C. Chemical messengers that help regulate body functions.

What is the main function of the endocrine system?

A. It releases chemical signals that help maintain internal balance.

B. It processes nutrients for energy and growth.

C. It coordinates voluntary and involuntary physical actions.

D. It circulates vital substances to organs and tissues.

Answer: A. It releases chemical signals that help maintain internal balance.

How does the endocrine system interact with the reproductive system?

A. It coordinates muscle activity needed for reproductive functions.

B. It supports circulation to reproductive organs.

C. It releases hormones that influence reproductive development and activity.

D. It provides nutrients needed for reproductive health.

Answer: C. It releases hormones that influence reproductive development and activity.

Why is it important that the endocrine and reproductive systems work together during puberty?

A. To support physical changes that affect overall energy levels.

B. To regulate internal processes related to growth and development.

C. To enhance brain function and emotional regulation.

D. To help the body mature and become capable of reproduction.

Answer: D. To help the body mature and become capable of reproduction.

Which of the following best describes how the skeletal system supports the body’s overall function?

A. It provides structure, safeguards internal organs, and enables movement in coordination with muscles.

B. It helps the body move by producing force and motion.

C. It contributes to circulation by supporting vessels and blood cell production.

D. It plays a role in communication between the brain and body through protective structures.

Answer: A. It provides structure, safeguards internal organs, and enables movement in coordination with muscles.

What kind of muscle makes up the heart?

A. Smooth muscle

B. Cardiac muscle

C. Skeletal muscle

D. Voluntary muscle

Answer: B Cardiac muscle

Why is the skeletal system essential for the production of blood cells?

A. It supports oxygen delivery by storing and transporting gases.

B. It contains soft tissue that contributes to blood cell formation.

C. It provides space for muscles that help circulate blood.

D. It helps regulate internal functions linked to blood flow and pressure.

 Answer: B It contains soft tissue that contributes to blood cell formation.

Why might a person with a spinal cord injury also have trouble walking, even if their leg bones and muscles are healthy?

A. Their immune system is unable to repair damage to the spinal cord.

B. Their nervous system can no longer transmit signals to the muscles for movement.

C. Their blood circulation is disrupted, affecting muscle function.

D. Their bones are no longer capable of supporting the body's weight and balance.

Answer: B. Their nervous system can no longer transmit signals to the muscles for movement.

A student lifts a heavy backpack and feels strain in their lower back. Which systems are MOST directly working together in this action?

A. The muscular system contracts to lift the backpack, while the nervous system sends signals for movement and the skeletal system provides support and structure.

B. The digestive system processes nutrients for energy, while the circulatory system helps distribute oxygen to muscles, and the respiratory system supports breathing.

C. The reproductive system regulates energy use, while the integumentary system protects the body, and the muscular system generates heat.

D. The nervous system monitors and adjusts balance, while the skeletal system supports body posture, and the endocrine system releases hormones for muscle function.

Answer: A. The muscular system contracts to lift the backpack, while the nervous system sends signals for movement and the skeletal system provides support and structure.

What role do red blood cells play in the circulatory system?

A. They work with white blood cells to protect the body from harmful invaders.

B. They transport oxygen from the lungs to the tissues and remove carbon dioxide.

C. They break down nutrients and help with digestion in the intestines.

D. They filter out waste from the bloodstream to maintain fluid balance.

Answer: B. They transport oxygen from the lungs to the tissues and remove carbon dioxide.

What happens in the alveoli of the lungs?

A. Blood cells are produced and circulated throughout the body.

B. Oxygen from the air diffuses into the blood, and carbon dioxide is removed from the blood.

C. Nutrients from food are absorbed into the bloodstream for energy.

D. The heart rate is controlled by signals from the lungs.

Answer: B. Oxygen from the air diffuses into the blood, and carbon dioxide is removed from the blood.

If the diaphragm were damaged, how would breathing be affected?

A. The lungs would work harder to produce oxygen, causing faster breathing.

B. Blood flow would be reversed, making it impossible for oxygen to reach the cells.

C. The lungs would struggle to expand and contract, making it difficult to breathe.

D. The diaphragm would be replaced by other muscles, allowing normal breathing to continue.

Answer: C. The lungs would struggle to expand and contract, making it difficult to breathe.

Which of the following BEST shows how the respiratory and circulatory systems maintain homeostasis?

A. Cooling the body by producing sweat to regulate temperature.

B. Breaking down food for energy and nutrients to fuel cells.

C. Carrying oxygen to the cells and removing carbon dioxide to maintain proper gas levels in the body.

D. Sending signals from the body to the brain to coordinate responses.

Answer: C. Carrying oxygen to the cells and removing carbon dioxide to maintain proper gas levels in the body.

A person has a genetic condition that reduces the number of red blood cells. How would this affect their body during exercise?

A. They would feel fatigued more quickly because less oxygen would be delivered to their muscles.

B. They would breathe more rapidly but be able to exercise for longer periods due to improved endurance.

C. Their body would stop producing carbon dioxide, making it easier to exercise.

D. Their muscles would increase their ability to store oxygen, improving athletic performance.

Answer: A. They would feel fatigued more quickly because less oxygen would be delivered to their muscles.

What is the purpose of the urinary system?

A. To break down food and absorb nutrients for energy.

B. To regulate breathing by controlling oxygen levels in the lungs.

C. To filter waste from the blood, remove excess substances, and maintain water balance.

D. To send signals to the brain and other parts of the body for coordinated responses.

Answer C: To filter waste from the blood, remove excess substances, and maintain water balance.

Why does food need to be broken down into smaller molecules in the digestive system?

A. So the body can store food in the stomach for later use.

B. So the nutrients can be absorbed by the intestines and transported to cells for energy.

C. So the body can release waste through exhalation.

D. So the body can combine the nutrients with oxygen to produce energy in cells.

Answer: B. So the nutrients can be absorbed by the intestines and transported to cells for energy.

If a person has a damaged small intestine, what might happen?

A. Their body will have difficulty absorbing nutrients from food, leading to malnutrition.

B. Their blood will not be able to carry oxygen, affecting cell function.

C. They will have trouble with the storage and elimination of urine.

D. They will stop producing digestive enzymes that break down food in the stomach.

Answer A. Their body will have difficulty absorbing nutrients from food, leading to malnutrition.

A person drinks a large amount of water. How will the urinary system respond?

A. The kidneys will stop filtering blood to prevent too much water from leaving the body.

B. The bladder will shrink in size, making it harder to store urine.

C. The kidneys will filter more water from the blood, producing extra urine to remove the excess.

D. The stomach will increase its ability to absorb the water for storage.

Answer C:The kidneys will filter more water from the blood, producing extra urine to remove the excess.

What evidence supports the idea that the digestive and circulatory systems work together?

A. The cardiac muscles help move food into the stomach for digestion.

B. Blood transports absorbed nutrients from the digestive system to cells in the body for nutrients.

C. The heart pumps bile into the stomach to assist in food breakdown.

D. The kidneys absorb nutrients directly from the digestive system after food is broken down.

Answer B: Blood transports absorbed nutrients from the digestive system to cells in the body for nutrients.

Imagine a student is running in a race. As the student starts running, their body undergoes various changes to help them perform better. Which of the following best describes how multiple body systems work together during this activity?

A. The muscular system allows the muscles to contract, the respiratory system delivers oxygen to the blood, the endocrine system slows down the heart rate, and the nervous system decreases breathing.

B. The muscular system moves the body by contracting muscles, the circulatory system pumps oxygen-rich blood to muscles, the respiratory system increases breathing to bring in more oxygen, and the nervous system coordinates movement and controls heart rate and breathing.

C. The muscular system stores energy, the respiratory system reduces oxygen intake, the circulatory system pumps waste into the lungs, and the endocrine system stops the heart from pumping faster.

D. The muscular system helps the body rest, the respiratory system prevents oxygen from reaching the muscles, the circulatory system prevents blood from leaving the heart, and the nervous system stops controlling movement.

Correct Answer:

B. The muscular system moves the body by contracting muscles, the circulatory system pumps oxygen-rich blood to muscles, the respiratory system increases breathing to bring in more oxygen, and the nervous system coordinates movement and controls heart rate and breathing.