Circulatory system

What is the purpose of completing active notes for each lesson?

• To use them during the open book test.

• To share them with classmates.

• To submit them for grading.

• To decorate the classroom.

Answer explanation

Completing active notes is essential for using them during the open book test, as they provide a valuable resource for answering questions and reinforcing understanding of the lesson material.

What is the primary function of the circulatory system?

• To digest food

• To transport blood around the body

• To produce hormones

• To store energy

Answer explanation

The primary function of the circulatory system is to transport blood around the body, delivering oxygen and nutrients to cells and removing waste products. This is essential for maintaining overall health and function.

Which components make up the circulatory system in mammals?

• Lungs, liver, and kidneys

• Heart, blood, and blood vessels

• Brain, nerves, and spinal cord

• Stomach, intestines, and pancreas

Answer explanation

The circulatory system in mammals consists of the heart, which pumps blood, blood that carries oxygen and nutrients, and blood vessels that transport blood throughout the body. Thus, the correct answer is heart, blood, and blood vessels.

What is the primary role of the circulatory system?

• To digest food

• To carry blood around the body

• To produce hormones

• To store energy

Answer explanation

The primary role of the circulatory system is to carry blood around the body, delivering oxygen and nutrients to cells while removing waste products. This function is essential for maintaining overall health and supporting bodily functions.

What does blood transport around the body in animals?

• Oxygen, nutrients, and carbon dioxide

• Water, vitamins, and minerals

• Proteins, fats, and carbohydrates

• Hormones, enzymes, and acids

Answer explanation

Blood transports oxygen from the lungs to cells, nutrients from the digestive system to tissues, and carbon dioxide from cells back to the lungs for exhalation. This makes 'Oxygen, nutrients, and carbon dioxide' the correct choice.

What is the primary function of red blood cells?

• Fight infections

• Transport oxygen

• Allow blood to clot

• Carry hormones

Answer explanation

The primary function of red blood cells is to transport oxygen from the lungs to the body's tissues. They contain hemoglobin, which binds to oxygen, making this function essential for cellular respiration and energy production.

Which type of blood cell is responsible for fighting infections?

• Red blood cells

• White blood cells

• Platelets

• Plasma

Answer explanation

White blood cells are the body's primary defense against infections. They identify and attack pathogens, making them crucial for the immune response, unlike red blood cells, platelets, or plasma.

What role do platelets play in the body?

• Transport oxygen

• Fight infections

• Allow blood to clot

• Carry hormones

Answer explanation

Platelets are crucial for hemostasis, the process that prevents and stops bleeding. They aggregate at injury sites and release chemicals that promote blood clotting, making 'Allow blood to clot' the correct answer.

What is the main function of arteries?

• To carry blood under low pressure back to the heart

• To allow exchange of materials between blood and tissues

• To carry blood under high pressure away from the heart

• To store blood

Answer explanation

The main function of arteries is to carry blood under high pressure away from the heart, delivering oxygen and nutrients to tissues. This distinguishes them from veins, which return blood to the heart under lower pressure.

Which type of blood vessel carries blood back to the heart under low pressure?

• Arteries

• Veins

• Capillaries

• Nerves

Answer explanation

Veins are the blood vessels that carry blood back to the heart under low pressure, unlike arteries which carry blood away from the heart under higher pressure. Capillaries are tiny vessels for exchange, and nerves are not blood vessels.