1.
The circulatory system
The circulatory system
Which organ pumps blood around the body?
Heart
Which gas do we take in during inhalation, and which gas do we release during exhalation?
Oxygen in, Carbon dioxide out
What is the biological process by which living organisms produce offspring to continue their species?
Reproduction
Washing your hands regularly is the simplest way to prevent what type of diseases?
Infectious/Contagious diseases)
What is the largest animal on Earth?
blue whale
What are the red cells in the blood that carry oxygen called?
red blood cells
Apart from the nose, what is the primary organ of the respiratory system?
Lungs
What is the name of the male reproductive cell?
Sperm
What is the general term for microscopic organisms (like bacteria or viruses) that cause disease?
Pathogens / Germs
What is the closest star to Earth?
Sun
What is the name of the thick-walled blood vessels that carry blood away from the heart?
Arteries
What are the tiny "air sacs" inside the lungs where gas exchange occurs?
Alveoli
In which organ are female reproductive cells (eggs) produced?
Ovaries
What is the name of the disease characterized by high sugar levels in the blood?
Diabetes
“What is the highest mountain in the world?
Mount Everest
Besides the heart and blood vessels, what is the vital fluid that makes up the circulatory system?
Blood
What is the large muscle that separates the chest cavity from the abdominal cavity and helps with breathing?
Diaphragm
- What is the process called when a male and female reproductive cell join together?
Fertilization
What special type of medicine is used specifically to treat illnesses caused by bacteria?
Antibiotics
If a 1-meter-long wooden stick is divided into 10 equal parts, how many centimeters is each part?
1 meter = 100 centimeters. Divided into 10 equal parts → each part is 10 centimeters.
What are the "flaps" or structures between heart chambers that ensure blood flows in only one direction?
Valves
What are the two main tubes that branch off from the trachea and enter the lungs?
Bronchi
In which organ does a fertilized egg develop and grow into a fetus?
Uterus / Womb
What is it called when the body's immune system overreacts to a substance like dust or certain foods?
Allergy
Why is it cold in winter and hot in summer?
Earth is tilted on its axis