About this Study Set
This study set covers Human Biology through
25 practice questions.
A collection of basic, curriculum-aligned multiple-choice questions covering core concepts in human biology for high school students. Every question includes the correct answer so you can learn as you go — pick any format above to get started.
Questions & Answers
Browse all 25 questions from the
Foundations of Human Biology study set below.
Each question shows the correct answer — select a study format above to practice interactively.
1
Which organelle is known as the 'powerhouse' of the cell because it generates most of the cell's supply of adenosine triphosphate (ATP), used as a source of chemical energy?
-
A
Nucleus
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B
Ribosome
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C
Mitochondrion
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D
Golgi apparatus
2
What is the primary function of red blood cells?
-
A
Fighting infection
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B
Transporting oxygen
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C
Clotting blood
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D
Producing hormones
3
The skeletal system provides support, protection, and allows for movement. Which bone is commonly known as the kneecap?
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A
Humerus
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B
Femur
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C
Tibia
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D
Patella
4
Which part of the brain is primarily responsible for coordination, balance, and posture?
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A
Cerebrum
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B
Cerebellum
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C
Brainstem
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D
Hypothalamus
5
Digestion begins in the mouth. What is the main role of saliva in this process?
-
A
Breaking down proteins
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B
Killing bacteria
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C
Lubricating food and starting carbohydrate digestion
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D
Absorbing nutrients
6
The respiratory system is responsible for gas exchange. What gas do humans primarily exhale?
-
A
Oxygen
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B
Nitrogen
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C
Carbon dioxide
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D
Hydrogen
7
Which type of muscle tissue is found in the walls of internal organs like the stomach and intestines, and is responsible for involuntary movements?
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A
Skeletal muscle
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B
Cardiac muscle
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C
Smooth muscle
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D
Nervous tissue
8
The circulatory system transports nutrients, oxygen, and waste products throughout the body. What is the main function of the heart?
-
A
Filtering waste
-
B
Pumping blood
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C
Producing red blood cells
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D
Storing oxygen
9
The nervous system allows for communication and control within the body. What is the basic structural and functional unit of the nervous system?
-
A
Neuron
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B
Glial cell
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C
Axon
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D
Dendrite
10
The endocrine system uses hormones to regulate bodily functions. Which gland produces insulin, a hormone that regulates blood sugar levels?
-
A
Thyroid gland
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B
Adrenal gland
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C
Pituitary gland
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D
Pancreas
11
What is the largest organ of the human body?
-
A
Liver
-
B
Brain
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C
Skin
-
D
Lungs
12
The immune system protects the body from disease. Which type of white blood cell is primarily responsible for producing antibodies?
-
A
Neutrophil
-
B
Lymphocyte
-
C
Macrophage
-
D
Eosinophil
13
The process by which plants and some bacteria use sunlight, water, and carbon dioxide to create their own food is called:
-
A
Respiration
-
B
Fermentation
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C
Photosynthesis
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D
Transpiration
14
Which of the following is a type of connective tissue found in joints that connects bone to bone?
-
A
Tendon
-
B
Ligament
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C
Cartilage
-
D
Muscle
15
The small intestine is the primary site for nutrient absorption. What are the finger-like projections that increase the surface area of the small intestine called?
-
A
Villi
-
B
Cilia
-
C
Flagella
-
D
Alveoli
16
What is the primary function of the kidneys?
-
A
Producing bile
-
B
Filtering blood and producing urine
-
C
Storing glycogen
-
D
Regulating body temperature
17
The reproductive system produces gametes. In males, what are the primary reproductive organs called?
-
A
Ovaries
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B
Uterus
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C
Testes
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D
Prostate gland
18
What is the scientific name for the thigh bone?
-
A
Tibia
-
B
Fibula
-
C
Humerus
-
D
Femur
19
Which gas is essential for cellular respiration, the process by which cells generate energy?
-
A
Carbon dioxide
-
B
Nitrogen
-
C
Oxygen
-
D
Methane
20
The sense of sight is processed in which part of the brain?
-
A
Temporal lobe
-
B
Parietal lobe
-
C
Frontal lobe
-
D
Occipital lobe
21
What is the fluid portion of blood called, which carries blood cells, nutrients, and waste products?
-
A
Plasma
-
B
Serum
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C
Lymph
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D
Cytoplasm
22
Which hormone is primarily responsible for the 'fight or flight' response?
-
A
Insulin
-
B
Thyroxine
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C
Adrenaline (Epinephrine)
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D
Estrogen
23
What is the process of breaking down food into smaller molecules that can be absorbed by the body called?
-
A
Assimilation
-
B
Metabolism
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C
Digestion
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D
Excretion
24
The human eye focuses light onto which light-sensitive layer at the back of the eye?
-
A
Cornea
-
B
Iris
-
C
Retina
-
D
Pupil
25
Which chamber of the heart receives deoxygenated blood from the body?
-
A
Left atrium
-
B
Left ventricle
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C
Right atrium
-
D
Right ventricle
