Human Body Systems

Which body system is mainly responsible for pumping blood and transporting oxygen to cells?

• Digestive system
• Skeletal system
• Nervous system
• Circulatory system

In the respiratory system, gas exchange between air and blood happens in tiny sacs called what?

• Villi
• Alveoli
• Bronchi
• Nephrons

Which organ produces bile that helps the body break down and digest fats?

• Spleen
• Kidney
• Liver
• Pancreas

What is the basic structural and functional unit of the nervous system that carries signals?

• Nephron
• Platelet
• Alveolus
• Neuron

Which organs filter wastes from the blood and produce urine in the excretory system?

• Intestines
• Lungs
• Kidneys
• Glands

What type of tissue connects muscles to bones so the body can move?

• Ligaments
• Tendons
• Cartilage
• Plasma

Most chemical digestion and absorption of nutrients into the blood occurs in which organ?

• The stomach
• The esophagus
• The large intestine
• The small intestine

Which system uses hormones from glands to regulate growth, mood, and metabolism?

• Endocrine system
• Lymphatic system
• Muscular system
• Skeletal system

Inside the heart, which chamber pumps oxygen-rich blood out to the rest of the body?

• Left atrium
• Right ventricle
• Right atrium
• Left ventricle

What is the largest organ of the body, part of the system that protects against germs?

• The lungs
• The brain
• The skin
• The heart

How many bones does an adult human have?

• 100
• 600
• 206
• 300

About how many muscles are in the muscular system?

• About 300
• About 206
• More than 600
• About 100

Bones make blood cells inside a soft tissue called bone ____.

• enamel
• cartilage
• marrow
• tendon

Which blood vessels carry blood away from the heart?

• Arteries
• Nerves
• Capillaries
• Veins

The heart beats around 100,000 times each day.

• True
• False