Understanding Variables and Heart Anatomy

What is the difference between independent and dependent variables?

• Independent variables are the results of experiments; dependent variables are the causes.

• Dependent variables are manipulated; independent variables are measured.

• Independent variables are manipulated; dependent variables are measured.

• Independent variables are always constant; dependent variables vary.

Define control variables and give an example.

• Plant species in a plant growth experiment

• Soil type in a plant growth experiment

• Humidity in a plant growth experiment

• An example of a control variable is temperature in a plant growth experiment, where all plants are kept at the same temperature to ensure that any differences in growth are due to other factors, such as light or water.

What does precision refer to in scientific measurements?

• Precision refers to the range of values in a data set.

• Precision indicates the average value of measurements.

• Precision measures the accuracy of a single measurement.

• Precision refers to the consistency of repeated measurements.

How is accuracy different from precision?

• Accuracy is about consistency; precision is about correctness.

• Accuracy measures the average; precision measures the range.

• Accuracy is about correctness; precision is about consistency.

• Accuracy is a measure of speed; precision is a measure of time.

Describe the function of the left ventricle in the heart.

• The left ventricle pumps blood to the lungs for oxygenation.

• The left ventricle regulates heart rate and rhythm.

• The left ventricle receives deoxygenated blood from the body.

• The left ventricle pumps oxygenated blood to the body.

What role do alveoli play in gas exchange?

• Alveoli are responsible for producing red blood cells.

• Alveoli facilitate gas exchange by allowing oxygen to enter the blood and carbon dioxide to be removed.

• Alveoli store carbon dioxide for later use.

• Alveoli filter out toxins from the air we breathe.

What is the significance of the right atrium in the circulatory system?

• The right atrium is significant as it collects deoxygenated blood from the body and directs it to the right ventricle for pulmonary circulation.

• The right atrium pumps oxygenated blood to the body.

• The right atrium regulates blood pressure in the circulatory system.

• The right atrium is responsible for nutrient absorption from the blood.

How does carbon dioxide move from the blood to the alveoli?

• Carbon dioxide moves from the blood to the alveoli by diffusion.

• Carbon dioxide moves from the alveoli to the blood by osmosis.

• Carbon dioxide is converted to oxygen in the blood before reaching the alveoli.

• Carbon dioxide is actively transported to the alveoli.

What is the purpose of the pulmonary arteries?

• To transport deoxygenated blood from the heart to the lungs.

• To transport nutrients to the body's tissues.

• To filter blood before it reaches the heart.

• To carry oxygenated blood from the lungs to the heart.

What is the relationship between heart rate and gas exchange efficiency?

• Higher heart rate decreases gas exchange efficiency.

• Heart rate has no effect on gas exchange efficiency.

• Lower heart rate is always better for gas exchange efficiency.

• Higher heart rate generally improves gas exchange efficiency.