Questions & Answers
Browse all 25 questions from the
Demography and Human Biology Basics study set below.
Each question shows the correct answer — select a study format above to practice interactively.
1
What is the average number of chambers in a healthy human heart?
2
Which organ is responsible for filtering waste from the human blood?
-
A
Liver
-
B
Lungs
-
C
Kidneys
-
D
Stomach
3
Approximately how many bones are in the skeleton of an average adult human?
4
Which nutrient is most essential for the health of human bones and teeth?
-
A
Calcium
-
B
Iron
-
C
Vitamin C
-
D
Fiber
5
What is the primary gas that humans exhale during respiration?
-
A
Oxygen
-
B
Nitrogen
-
C
Carbon dioxide
-
D
Hydrogen
6
Which blood type is known as the universal donor, capable of being given to most recipients?
7
What is the largest organ of the human body?
-
A
Liver
-
B
Skin
-
C
Brain
-
D
Heart
8
Which sense organ is primarily used to detect sound?
-
A
Nose
-
B
Eye
-
C
Ear
-
D
Tongue
9
What is the average number of teeth in a full set of adult human teeth, including wisdom teeth?
10
Which muscle is primarily responsible for pumping blood throughout the body?
-
A
Diaphragm
-
B
Heart
-
C
Biceps
-
D
Quadriceps
11
What part of the human body contains the most sensory nerve endings?
-
A
Fingertips
-
B
Elbows
-
C
Knees
-
D
Heels
12
Which essential mineral is required for the production of red blood cells to transport oxygen?
-
A
Calcium
-
B
Iron
-
C
Zinc
-
D
Magnesium
13
What is the main purpose of the human endocrine system?
-
A
Digestion
-
B
Hormone production
-
C
Blood filtration
-
D
Bone growth
14
Which part of the eye is responsible for focusing light onto the retina?
-
A
Pupil
-
B
Iris
-
C
Lens
-
D
Cornea
15
Approximately what percentage of the adult human body is made up of water?
16
Which human organ is responsible for producing bile to assist in digestion?
-
A
Liver
-
B
Pancreas
-
C
Gallbladder
-
D
Stomach
17
What is the primary function of white blood cells in the human immune system?
-
A
Clotting blood
-
B
Fighting infection
-
C
Carrying oxygen
-
D
Storing energy
18
Which bone in the human body is known as the strongest?
-
A
Femur
-
B
Skull
-
C
Humerus
-
D
Rib
19
What is the average resting heart rate for a healthy adult in beats per minute?
-
A
20-40
-
B
60-100
-
C
120-140
-
D
150-180
20
Which vitamin is primarily synthesized by the human body when exposed to sunlight?
-
A
Vitamin A
-
B
Vitamin C
-
C
Vitamin D
-
D
Vitamin K
21
What is the longest section of the human digestive tract?
-
A
Esophagus
-
B
Stomach
-
C
Small intestine
-
D
Large intestine
22
Which substance gives human skin and hair its pigment?
-
A
Keratin
-
B
Melanin
-
C
Collagen
-
D
Hemoglobin
23
How many pairs of ribs does the average human typically have?
24
Which organ is known for its ability to regenerate tissue after partial removal?
-
A
Heart
-
B
Brain
-
C
Liver
-
D
Kidney
25
What is the primary function of the human nervous system?
-
A
Digestion
-
B
Signal transmission
-
C
Blood circulation
-
D
Oxygen intake
