Variables and the Scientific Method
Define "independent variable"
the variable that the scientist changes
The smallest unit of life (aka the building block of life is called a ________________________
cell
_______________ are tube-shaped structures that move blood throughout the body.
Blood vessels
Which organ system is the heart a part of?
Cardiovascular System
Name one function of blood.
brings oxygen to body, brings nutrients to body, fights infection, clots, etc.
After asking a question and before designing and performing an experiment, what should a scientist do?
Formulate a hypothesis
What does the G in GRACE stand for?
Growth
What is one function of the cardiovascular system?
To move nutrients through the body
To move oxygen through the body
(something similar)
Name the four chambers of the heart.
Right atrium, right ventricle, left atrium, left ventricle
What color is blood that is oxygen rich?
Red
What was the dependent variable in the heart rate lab?
Heart rate
Groups of cells that have a similar structure and work together to perform a specific function are called _________________________
tissues
Name the three parts of the cardiovascular system.
Blood, blood vessels, heart
Blood leaves the heart through the _____________
The yellow liquid that makes up a little more than 50% of blood is called what?
Plasma
Annie wants to know if espresso makes teachers more energetic. One week, she times how long it takes the teacher to go up the stairs without drinking espresso. The next week, she gives them espresso as soon as they walk in, and then she times them walking up the stairs. What is the independent variable for this experiment? The dependent variable? A controlled variable?
Independent Variable: espresso
Dependent variable: how long it takes teachers to walk up stairs
Controlled variable: same staircase, teachers get same amount of sleep, etc.
Name the 5 characteristics of living things.
Growth, Reproduction, Adaptation, Cells, Energy
Why does your heart beat more quickly when you exercise?
Your body needs more oxygen when you exercise, so your heart beats more quickly so the oxygen can circulate more quickly.
muscle
______________________ are tiny and help to stop bleeding.
Platelets
Name the six steps of the scientific method in order.
1) Make an observation
2) Ask a question
3) Formulate a hypothesis
4) Test with an experiment
5) Analyze results
6) Draw conclusions
Which part of the hierarchy of living things is blood?
Tissue (specifically, connective tissue)
What is one thing that blood carries out of cells?
Waste OR carbon dioxide
How many valves does the heart have?
4
Which part of blood does the body make more of when you are fighting an infection?
White blood cells