Psychology · Unit 6
The Brain and Behavior
The biology behind how we think and act
Biological psychology asks how physical structures produce behaviour, and it is the point where this subject and biology become one field.
The unit covers neurons, the nervous system, chemical messengers, brain regions, and the two hemispheres.
This unit breaks down into 23 short steps and 116 questions, starting at difficulty 1 and building to 5. Below you can see exactly what it covers, how the path is structured, and worked examples with explanations.
- Steps
- 23
- Questions
- 116
- Difficulty
- 1-5
What this unit covers
- Neurons
- The Two Hemispheres
- Chemical Messengers
- The Nervous System
- Regions of the Brain
Where this fits
Overlaps with Biology's Nervous System and Brain.
Where people slip
The left-brain and right-brain personality idea is not supported. Hemispheres do specialise for some functions, and that is a long way from creative and logical people.
How the unit is structured
The Brain and Behavior runs as 23 short steps that unlock in order. 17 are practice rounds and 6 are challenge rounds that pull together everything before them. Questions start at difficulty 1 and climb to 5 as you progress.
Challenge rounds
Example questions
30 real questions from this unit, with the answer and the reason behind it, grouped by what they practise. There are 116 in the unit altogether.
Chemical Messengers
- Choose all that applyLevel 2
1. Which of these are chemical messengers in the brain? Pick all that apply.
- Dopaminecorrect
- Serotonincorrect
- Sand
- Rubber
Dopamine and serotonin are brain chemical messengers, while sand and rubber are not.
- Fill the blankLevel 2
2. ____ is a brain chemical linked to reward and feeling good.
- Dopaminecorrect
- Calcium
- Water
- Sugar
Dopamine is a chemical messenger tied to reward and pleasant feelings.
- Multiple choiceLevel 2
3. Neurons send messages to each other using tiny chemicals called what?
- Neurotransmitterscorrect
- Bones
- Vitamins
- Germs
Neurotransmitters are the chemical messengers that carry signals between neurons.
- Odd one outLevel 2
4. Which of these is NOT a brain chemical messenger?
- Plasticcorrect
- Dopamine
- Serotonin
- Endorphins
Plastic is a material, not a chemical messenger made by the brain.
- True or falseLevel 2
5. Chemical messengers help carry a signal across the gap between two neurons.
Answer: True
True. Neurotransmitters cross the synapse to pass the message along.
- Match the pairsLevel 3
6. Match each chemical messenger to what it is often linked with.
Answer: Dopamine = Reward; Serotonin = Mood; Endorphins = Pain relief; Acetylcholine = Muscle movement
Dopamine links to reward, serotonin to mood, endorphins to pain relief, and acetylcholine to muscle movement.
Neurons
- Multiple choiceLevel 1
7. What is the special job of a neuron?
- To carry messages around the bodycorrect
- To pump blood to the heart
- To digest your food
- To grow your bones
A neuron is a nerve cell whose job is to carry messages around your brain and body.
- Odd one outLevel 1
8. Which of these is NOT a part of a neuron?
- Stomachcorrect
- Axon
- Dendrite
- Cell body
The stomach is a digestive organ, not a part of a nerve cell.
- True or falseLevel 1
9. Neurons are the cells that send and receive signals in your brain.
Answer: True
True. Neurons are the message cells of the brain and nervous system.
- Fill the blankLevel 2
10. The long part of a neuron that carries a signal away from the cell body is the ____.
- axoncorrect
- dendrite
- muscle
- bone
The axon is the long fiber that carries the signal away from the neuron.
- Type the answerLevel 2
11. The tiny gap between two neurons where a signal passes across is called a ____.
Answer: synapse
The synapse is the small gap where one neuron passes its message to the next.
- Put in orderLevel 3
12. Put the parts of a neuron in the order a signal travels through them.
Answer: Dendrites -> Cell body -> Axon -> Synapse
A signal is received by dendrites, moves through the cell body and axon, then reaches the synapse.
Regions of the Brain
- Multiple choiceLevel 1
13. Which part of the brain helps you keep your balance and coordinate movement?
- The cerebellumcorrect
- The occipital lobe
- The skin
- The heart
The cerebellum at the back of the brain helps with balance and smooth movement.
- Odd one outLevel 1
14. Which of these is NOT a part of the brain?
- Elbowcorrect
- Cerebrum
- Cerebellum
- Frontal lobe
The elbow is a joint in your arm, not a part of the brain.
- Fill the blankLevel 2
15. The ____ lobe helps you understand what your eyes see.
- occipitalcorrect
- frontal
- nose
- hand
The occipital lobe processes vision from your eyes.
- Match the pairsLevel 2
16. Match each brain part to the job it helps with.
Answer: Cerebellum = Balance; Occipital lobe = Vision; Frontal lobe = Planning; Hippocampus = Memory
Each of these brain parts has its own main job.
- Sort into groupsLevel 2
17. Sort each item into where it belongs.
Answer: Cerebellum = Brain part; Frontal lobe = Brain part; Elbow = Not the brain; Toe = Not the brain
The cerebellum and frontal lobe are brain parts, while the elbow and toe are not.
- True or falseLevel 2
18. The frontal lobe at the front of the brain helps with planning and making decisions.
Answer: True
True. The frontal lobe is important for planning, decisions, and self control.
The Nervous System
- Fill the blankLevel 2
19. Messages travel between your brain and body along thin threads called ____.
- nervescorrect
- bones
- muscles
- hairs
Nerves are the threads that carry messages between the brain and the body.
- Multiple choiceLevel 2
20. The central nervous system is made of the brain and what other part?
- The spinal cordcorrect
- The stomach
- The lungs
- The kidneys
The central nervous system is the brain plus the spinal cord.
- Odd one outLevel 2
21. Which of these is NOT part of the nervous system?
- Livercorrect
- Brain
- Spinal cord
- Nerves
The liver is a digestive organ and is not part of the nervous system.
- Put in orderLevel 2
22. Put these in order for how a reflex happens when you touch a hot pan.
Answer: You touch a hot pan -> Nerves carry the message inward -> Your spinal cord reacts -> You pull your hand back
The nerves carry the message in, the spinal cord reacts, and then you pull away.
- True or falseLevel 2
23. If you touch something very hot, your hand can pull back before you even think about it.
Answer: True
True. That fast automatic action is a reflex handled by your spinal cord.
- Sort into groupsLevel 3
24. Sort each part into the central or the peripheral nervous system.
Answer: Brain = Central; Spinal cord = Central; Nerves in the arm = Peripheral; Nerves in the leg = Peripheral
The brain and spinal cord are central, while nerves in the arm and leg are peripheral.
The Two Hemispheres
- Guess the numberLevel 1
25. How many hemispheres does the human brain have?
Answer: 2
The brain is split into 2 hemispheres, left and right.
- Multiple choiceLevel 1
26. How many halves, or hemispheres, does the brain have?
- Twocorrect
- One
- Five
- Ten
The brain has two halves, a left hemisphere and a right hemisphere.
- True or falseLevel 1
27. The brain is split into a left half and a right half.
Answer: True
True. The brain has a left hemisphere and a right hemisphere.
- Fill the blankLevel 2
28. The thick band of nerves that connects the left and right halves of the brain is the corpus ____.
- callosumcorrect
- cerebrum
- lobe
- nerve
The corpus callosum is the bridge of nerves joining the two hemispheres.
- Type the answerLevel 2
29. Each half of the brain is called a ____.
Answer: hemisphere
Each side of the brain is called a hemisphere.
- Odd one outLevel 3
30. Which statement about the two hemispheres is FALSE?
- They never work togethercorrect
- They are joined by the corpus callosum
- Each mainly controls the opposite side of the body
- There is a left and a right hemisphere
The two hemispheres constantly work together, so the idea that they never cooperate is false.
Where these questions come from. Each unit starts as a plan of the concepts it should cover and the difficulty it should span. Questions are written against that plan with AI assistance, then checked by a validator that rejects anything without a single defensible answer, an explanation, or plausible wrong options. How we write questions sets out the whole process, and corrections are fixed in the bank and reach the site and the app the same day.
How you practise
This unit mixes 10 different question formats, so you are recalling and applying rather than recognising the same layout every time.
- Choose all that apply
- Fill the blank
- Guess the number
- Match the pairs
- Multiple choice
- Odd one out
- Put in order
- Sort into groups
- True or false
- Type the answer
Practise The Brain and Behavior
116 questions across 23 steps. Start with step one and crawl at your own pace.
Play this unitRead about The Brain and Behavior
Explainers from our blog on what this unit covers. Each one ends with real questions from the bank.
- What Is Neuroplasticity? How the Brain Changes with ExperienceLearn how experience can change brain connections and function, why practice matters, and what plasticity does not promise.August 14, 2026 · 6 min read
- Brain Food: How What You Eat Affects FocusYour brain runs on what you eat and drink. A few gentle food habits can steady your energy and make focus feel easier, no fad diets required.October 8, 2025 · 5 min read
- Why Do We Yawn?The leading theories including brain cooling, why the oxygen explanation is wrong, and why yawning is so contagious.August 28, 2026 · 5 min read
More units in Psychology
- What is Psychology?What psychology studies and why we behave
- Feelings and EmotionsBasic emotions and how we handle them
- Senses and PerceptionHow we take in and make sense of the world
- MemoryHow we remember and why we forget
- Learning and HabitsHow we learn and form habits
- How We GrowDevelopment across childhood and life
- Thinking and CognitionProblem solving, decisions and thinking traps
- Motivation and EmotionWhat drives us, and theories of emotion