Body Wonders Study Guide
Human Body Wonders
2nd Grade Science Study Guide • Page 1 of 3
Name:
Date:
The Five Senses & Visible Sense Organs
All Visible Organs!
While many organs are hidden deep inside, your sense organs are all located on the outside of your body where you can see them!
👀
Eyes
Sense of Sight
👂
Ears
Sense of Hearing
👃
Nose
Sense of Smell
👅
Tongue
Sense of Taste
✋
Skin
Sense of Touch
Microscopic Cells & Anton van Leeuwenhoek
• All living things (including you!) are made of tiny building blocks called cells.
• Cells are microscopic—so small they can only be seen through a powerful microscope!
• Anton van Leeuwenhoek lived hundreds of years ago in a Dutch village. His curiosity and lens-making skills led him to observe and name microscopic cells and tiny one-celled bacteria!
Anton van Leeuwenhoek
Father of Microbiology discovered microscopic life!
How Your Body Is Built: From Cells to Systems
Every part of you works in a team, from smallest to biggest:
Step 1
1. Cells
🔬
The smallest living building block of all life.
Step 2
2. Tissues
🧬
Groups of similar cells joined to do one job.
Step 3
3. Organs
🫀
Tissues grouped to do special jobs (heart, brain, stomach).
Step 4
4. Systems
🧍
Teams of organs working together to keep you alive!
The Six Super Systems in the Human Body
🦴 Skeletal System
206 bones give your body shape and protect inner organs.
💪 Muscular System
Works with bones to help you walk, jump, and smile.
❤️ Circulatory System
Heart and blood vessels pump oxygen and nutrients all over.
🧠 Nervous System
Brain and nerves send messages so you can think and feel.
🥗 Digestive System
Breaks down food to provide fuel and energy for life.
💧 Excretory System
Filters liquid waste and balances water to keep body clean.
Unit 2: The Human Body Study Companion Turn page for Digestion, Excretion & Nutrition ➔
Digestion, Excretion & Nutrition
How We Nourish Our Bodies • Page 2 of 3
Core Systems
The Great Digestive Journey (From Mouth to Waste)
1
Mouth & Saliva: Teeth chew food into small pieces. Saliva (spit) softens food and starts breaking down nutrients right away.
2
Esophagus: The long, stretchy food tube near your windpipe that moves swallowed food from your throat down into your stomach.
3
Stomach & Liver: The stomach churns food with powerful digestive juices into liquid. The liver produces bile and helps process nutrients.
4
Small Intestine & Villi: A long coiled tube! Tiny finger-like bumps called villi absorb nutrients into the bloodstream to nourish cells.
5
Large Intestine: Absorbs leftover water. Undigested parts form solid waste (feces) that is removed from the body.
The Excretory System: Liquid Waste Cleaners
The excretory system removes liquid waste and keeps water balanced.
Kidneys
Two bean-shaped organs that filter waste from blood.
Ureters
Two tubes carrying urine down to the bladder.
Bladder
Stretchy muscular bag that stores urine safely.
Urethra
The tube where urine leaves the body.
🤝 How They Work Together: The digestive system absorbs food nutrients and water into your blood. As cells use nutrients, waste enters the blood. The excretory system (kidneys) filters out that waste with extra water so your body stays clean and healthy!
Fueling Your Body: Balanced Diet & Essential Nutrients
🌾 Carbohydrates
The body's main energy fuel! Found in whole grains, oats, brown rice, and fruits.
🥦 Vitamins & Minerals
Needed in small amounts! Calcium in milk strengthens bones; vitamins boost immunity.
⚖️ Moderation & Water
Treats like fries are okay sometimes, not daily. Drink plenty of fresh water every day!
Unit 2: The Human Body Study Companion Turn page for Vocabulary & Review Riddles ➔
Vocabulary Bank & Riddles
Word Definitions & Riddle Review • Page 3 of 3
Word Masters
Core Body Vocabulary (Definitions & Sentence Examples)
1. Absorb: To take in or soak up a liquid or nutrient.
"The villi absorb healthy nutrients into the blood."
2. Bladder: A stretchy organ that holds liquid urine.
"My bladder fills up when I drink water during recess."
3. Carbohydrates: Nutrients that give the body energy.
"Oatmeal gives us carbohydrates to run and play."
4. Cells: The microscopic building blocks of all living things.
"All plants and animals are made of tiny cells."
5. Essential: Completely necessary or needed for life.
"Getting enough sleep and clean water is essential."
6. Intestines: Long tubes that absorb nutrients and water.
"Food moves through the small and large intestines."
7. Kidney: Bean-shaped organ that filters liquid waste.
"Each kidney balances water and cleans our blood."
8. Liver: A large organ that cleans blood and makes bile.
"The liver is a hardworking organ inside our abdomen."
9. Minerals: Natural nutrients needed for strong bodies.
"Milk provides calcium, an essential mineral for teeth."
10. Moderation: Not too much and not too little of something.
"Eating sweets in moderation keeps our bodies happy."
11. Nourish: To feed with nutrients needed to grow strong.
"Fresh apples and vegetables nourish our growing bodies."
12. Nutrition: The healthy food and drinks our bodies need.
"A balanced meal gives us great nutrition all day."
13. Nutritionist: An expert who helps people choose healthy food.
"The nutritionist showed us how to build a colorful plate."
14. Saliva: The clear liquid in your mouth that wets food.
"Saliva helps swallow food smoothly down the throat."
15. Systems: Groups of organs that work together to perform big body jobs.
"The digestive and excretory systems work together to process food and clean waste."
Body Detective Riddles (Test Your Memory!) Can you solve them all?
"All of your sense organs are visible on the outside. What are we?"
➔ Eyes, ears, nose, tongue, skin
"I lived in a Dutch village and my curiosity led me to see cells. Who am I?"
➔ Anton van Leeuwenhoek
"The urethra and two ureters carry urine out. What system am I?"
➔ The excretory system
"The food tube near your windpipe taking food to your stomach is me. What am I?"
➔ Esophagus
"Important nutrient in the first two years of life, but limit me after. What am I?"
➔ Fats
"Needed in smaller amounts than proteins, fats, and carbs. What are we?"
➔ Vitamins & minerals
"A liquid that is vitally important to all life on Earth. What am I?"
➔ Water
"Fried potato snack from fast food, unhealthy to eat every day. What am I?"
➔ French fries
"Made of cells and tissues; we include both heart and brain. What are we?"
➔ Organs
Unit 2: The Human Body Study Companion Ready for the Practice Test! ⭐
Body Detectives Practice Test
Body Detectives Practice Test
Unit Review • Science Grade 2 • Page 1 of 2
Name:
Date:
Total Score
___ / 25
1 Part 1: How Your Body Is Built (Diagram)
4 Points
Use the Word Bank to label each picture in order from smallest unit to biggest team:
Word Bank: Cells • Tissues • Organs • Systems
🔬
1. These are:
🧬
2. These are:
🫀
3. These are:
🧍
4. These are:
2 Part 2: The Five Senses & Visible Organs
5 Points
Write the letter of the correct sense organ next to the sense:
Visible Sense Organs:
A. Eyes
B. Ears
C. Nose
D. Tongue
E. Skin
Sense of Hearing (listening to a story)
Sense of Sight (reading words in a book)
Sense of Smell (baking warm bread)
Sense of Taste (eating a sweet apple)
Sense of Touch (feeling a soft sweater)
3 Part 3: The Six Major Systems
6 Points
Write the letter of the matching body system in each box:
Body Systems:
A. Skeletal System
B. Muscular System
C. Circulatory System
D. Nervous System
E. Digestive System
F. Excretory System
Pumps blood and nutrients through the heart
206 bones that give shape & protect organs
Brain and nerves that send messages to think
Breaks down food to give your body fuel
Filters liquid waste and balances body water
Works with bones to help you run and jump
Turn over for Digestion Sequence, Riddles & Nutrition ➔ Page 1 of 2
Body Detectives Practice Test
Digestion, Riddles & Nutrition • Page 2 of 2
Part Two
4 Part 4: The Great Digestion Sequence Cards
5 Points
Number the cards from 1 to 5 to show the path of food from start to finish:
The stomach churns food with digestive juices into liquid mush.
Body Detectives Answer Key
Body Detectives Answer Key
Teacher Edition
Solutions & Scoring Rubric • Science Grade 2 • Page 1 of 2
Total: 25 Points
Passing Standard: 20/25 (80%)
1 Part 1: How Your Body Is Built (4 Points)
1 pt per label
🔬
1. Smallest
Cells
🧬
2. Joined Cells
Tissues
🫀
3. Special Job
Organs
🧍
4. Organ Team
Systems
💡 Teacher Note: Students should identify that hierarchy begins with microscopic cells, which bundle into tissues, form organs (like heart and stomach), and build body systems.
2 Part 2: The Five Senses & Visible Organs (5 Points)
1 pt each
Sense of Hearing: B (Ears)
Sense of Sight: A (Eyes)
Sense of Smell: C (Nose)
Sense of Taste: D (Tongue)
Sense of Touch: E (Skin)
All 5 sense organs are visible on the outside of the body.
3 Part 3: The Six Major Systems (6 Points)
1 pt each
Pumps blood through heart: C. Circulatory
206 bones that give shape: A. Skeletal
Brain & nerves send messages: D. Nervous
Breaks down food for fuel: E. Digestive
Filters liquid waste/kidneys: F. Excretory
Works with bones to move: B. Muscular
Turn over for Parts 4, 5, 6, and 7 Solutions ➔ Page 1 of 2
Body Detectives Answer Key
Digestion, Riddles, Nutrition & Rubric • Page 2 of 2
Grading Guide
4 Part 4: Digestive Sequence Card Solution (5 Points)
1 pt per correct order
3
The stomach churns food with digestive juices into liquid mush.
1
Teeth chew food in the mouth, and saliva wets it to begin digestion.
5
The large intestine takes in extra water; undigested waste leaves body.
2
Swallowed food travels down the long, stretchy esophagus tube.
4
Tiny villi in the small intestine absorb healthy nutrients into the blood.
5 Part 5: Detective Mystery Riddles (3 Points)
1 pt each
Riddle 1 (Dutch village / cells):
Anton van Leeuwenhoek
(Accept Leeuwenhoek)
Riddle 2 (Ureters & urethra):
Excretory System
(Accept urinary system)
