Human Body Systems Quiz

Which system carries nutrients and oxygen to cells and removes waste?

• Nervous

• Respiratory

• Cardiovascular

• Digestive

Answer explanation

The cardiovascular system is responsible for transporting nutrients and oxygen to muscle cells while also removing carbon dioxide and waste products, making it the correct choice for this function.

What does the brain tell the body to increase based on carbon dioxide levels in the blood?

• Heart rate

• Breathing rate

• Blood pressure

• Muscle movement

Answer explanation

The brain monitors carbon dioxide levels in the blood. When CO2 increases, it signals the body to increase the breathing rate to expel more CO2, thus maintaining proper gas exchange and homeostasis.

Which two systems are involved when the brain communicates with the lungs?

• Cardiovascular and muscular

• Nervous and respiratory

• Digestive and nervous

• Muscular and respiratory

Answer explanation

The brain communicates with the lungs primarily through the nervous system, which sends signals to control breathing. The respiratory system is directly involved in the process of gas exchange, making 'Nervous and respiratory' the correct choice.

What do blood vessels carry to the lungs to remove carbon dioxide?

• White blood cells

• Platelets

• Red blood cells

• Plasma

Answer explanation

Red blood cells carry carbon dioxide from the body's tissues to the lungs, where it is expelled. They are essential for gas exchange, making them the correct choice for what blood vessels transport to eliminate carbon dioxide.

Which two systems deliver oxygen to all body cells?

• Cardiovascular and digestive

• Nervous and muscular

• Cardiovascular and respiratory

• Digestive and muscular

Answer explanation

The cardiovascular system transports oxygen-rich blood from the lungs to all body cells, while the respiratory system facilitates the exchange of oxygen and carbon dioxide in the lungs. Together, they ensure oxygen delivery.

What do blood vessels deliver to intestinal cells?

• Hormones

• Nutrients and oxygen

• Enzymes

• Carbon dioxide

Answer explanation

Blood vessels deliver nutrients and oxygen to intestinal cells, which are essential for their metabolic functions and overall health. Hormones and enzymes play different roles, while carbon dioxide is a waste product.

Which two systems are involved in sending messages to muscles for movement?

• Cardiovascular and digestive

• Nervous and muscular

• Respiratory and digestive

• Muscular and cardiovascular

Answer explanation

The nervous system sends signals to muscles, enabling movement. The muscular system then contracts in response to these signals, facilitating motion. Thus, the correct systems involved are the nervous and muscular.

Which system is responsible for carrying oxygen from the lungs to all cells in the body?

• Nervous

• Respiratory

• Cardiovascular

• Digestive

Answer explanation

The cardiovascular system is responsible for transporting oxygen from the lungs to all cells in the body through the blood. The nervous system controls body functions, the respiratory system facilitates gas exchange, and the digestive system processes food.

What do blood vessels pick up from the intestines?

• Oxygen

• Nutrients

• Carbon dioxide

• Hormones

Answer explanation

Blood vessels pick up nutrients from the intestines after digestion. These nutrients are essential for providing energy and supporting bodily functions, making 'Nutrients' the correct answer.

Which two systems are involved in the process of digestion and nutrient absorption?

• Cardiovascular and nervous

• Digestive and cardiovascular

• Respiratory and muscular

• Nervous and muscular

Answer explanation

The digestive system breaks down food and absorbs nutrients, while the cardiovascular system transports these nutrients throughout the body. Therefore, the correct answer is 'Digestive and cardiovascular'.