Homeostasis
What is the process of maintaining stable internal conditions in the body called?
Homeostasis
Which body system transports oxygen and nutrients throughout the body?
Circulatory system
What does DNA stand for?
What is the main job of a red blood cell?
Carry oxygen
What type of cell division produces two genetically similar daughter cells for growth and repair?
Mitosis
What type of feedback mechanism reverses a change to bring the body back toward normal conditions?
Negative Feedback
Which two systems work together to bring oxygen into the body and deliver it to cells?
Respiratory and circulatory
What is the shape of a DNA molecule commonly called?
Double helix
Which specialized cells transmit electrical signals throughout the nervous system?
Neurons
Which type of molecule carries instructions from DNA to ribosomes for protein production?
RNA
When your body sweats to cool you down on a hot day, what process is taking place?
Homeostasis
Which body system breaks down food so nutrients can be absorbed?
Digestive system
Which four nitrogen bases are found in DNA?
A, T, C, and G
Which cell structure allows a sperm cell to swim toward an egg?
Flagellum
What is the basic unit of structure and function in living things?
One example of positive feedback in the human body?
Contractions during childbirth becoming stronger
Which system uses hormones to help regulate growth, metabolism, and other body functions?
Endocrine system
In DNA, which base pairs with adenine (A)?
Thymine (T)
What is the main function of a white blood cell?
Defend the body against pathogens
If the body becomes too cold, shivering helps warm it up. Is this an example of positive or negative feedback?
Negative feedback
What part of the brain helps regulate body temperature?
Hypothalamus
When you run, your muscles need more oxygen. Which system responds by increasing your breathing rate?
Respiratory system
Where is most of the DNA found in a human cell?
Nucleus
Which specialized cells contract to produce movement?
Muscle cells
Why do multicellular organisms need specialized cells?
Specialized cells perform particular functions efficiently