Cells
What is a cell?
A tiny building block that makes up every living thing.
What does DNA stand for?
Deoxyribonucleic acid.
What is the function of the circulatory system?
Transports blood, oxygen, and nutrients throughout the body.
Which blood cells are small, round discs that carry oxygen throughout the body?
Red blood cells
Name two functions of bones.
Support and shape the body, protect organs, make blood cells, or store minerals.
What are organelles?
Tiny structures inside a cell that have special jobs.
What is the job of DNA?
Tells cells how to grow and function.
What are the three main parts of the circulatory system?
Heart, blood, and blood vessels.
Which blood cells fight germs and infections?
White blood cells
Name two things that help strengthen bones.
Calcium, vitamin D, phosphorus, or exercise.
What is the cell membrane?
A thin, flexible layer that surrounds and protects the cell.
How many chromosomes do humans normally have?
46
What do blood vessels do?
Carry blood throughout the body.
True or False: Platelets are tiny cell fragments that help stop bleeding.
True
Name the three main layers or regions of bone.
Periosteum, compact bone, and spongy bone.
What is the nucleus?
The control center of the cell that holds DNA.
Name two traits influenced by DNA.
Eye color, hair color, or hair texture.
What are the three types of blood vessels?
Veins, arteries, and capillaries.
What is the function of plasma?
Carries blood cells, nutrients, hormones, and waste throughout the body.
Why do babies have more bones than adults?
Some bones fuse together as babies grow.
What is cytoplasm?
Jelly-like fluid that fills the cell and holds organelles in place.
DNA is packed into structures called ________.
Chromosomes
Which blood vessels have the thickest walls to withstand pressure from the heart?
Arteries
Name the four main jobs of blood.
Deliver, Defend, Repair, and Transport
Name four different types of joints.
Hinge, ball-and-socket, saddle, gliding, pivot, or ellipsoidal joints.