Circulatory System
The circulatory system, also known as the cardiovascular system, is responsible for the transportation of blood, nutrients, gases, and waste products throughout the body. It consists of the heart, blood vessels, and blood.
Key Components of the Circulatory System
- Heart: The muscular organ that pumps blood throughout the body.
- Blood Vessels: Include arteries, veins, and capillaries, which transport blood to and from the heart to all parts of the body.
- Blood: Contains red blood cells, white blood cells, platelets, and plasma, and is responsible for carrying oxygen, nutrients, and waste products.
Functions of the Circulatory System
The circulatory system has several important functions:
- Transportation: It transports oxygen, nutrients, hormones, and waste products to and from cells throughout the body.
- Regulation: It helps regulate body temperature, pH levels, and fluid balance.
- Protection: It plays a role in the immune response and clotting to prevent excessive bleeding.
Path of Blood Through the Circulatory System
Blood flows through the circulatory system in the following sequence:
- Heart: Blood is pumped from the heart to the lungs and the rest of the body.
- Lungs: In the lungs, blood picks up oxygen and releases carbon dioxide.
- Rest of the Body: Oxygen-rich blood is carried to the body's tissues and organs, while carbon dioxide and waste products are picked up.
- Heart (again): Deoxygenated blood returns to the heart to be pumped to the lungs and the cycle begins again.
Disorders of the Circulatory System
Several disorders can affect the circulatory system, including:
- Hypertension: High blood pressure, which can lead to heart disease and stroke.
- Coronary Artery Disease: Narrowing or blockage of the coronary arteries, leading to decreased blood flow to the heart.
- Heart Failure: The heart's inability to pump enough blood to meet the body's needs.
- Stroke: Disruption of blood flow to the brain, leading to brain damage.
Study Guide
When studying the circulatory system, focus on the following key points:
- Identify the main components of the circulatory system and their functions.
- Understand the path of blood through the circulatory system, including the roles of the heart, lungs, and body tissues.
- Learn about common disorders of the circulatory system and their impact on overall health.
- Explore the factors that can affect circulatory system health, such as diet, exercise, and stress.
Remember to review diagrams and illustrations of the circulatory system to help visualize the flow of blood and the structures involved.
.◂Science Worksheets and Study Guides Eighth Grade. Earthquakes
Worksheet/Answer key
Earthquakes 
Worksheet/Answer key
Earthquakes Worksheet/Answer key
Earthquakes Vocabulary/Answer key
Earthquakes Vocabulary/Answer key
Earthquakes Vocabulary/Answer key
Earthquakes Vocabulary/Answer key
Earthquakes
Worksheet/Answer keyWorksheet/Answer keyVocabulary/Answer keyVocabulary/Answer keyVocabulary/Answer keyVocabulary/Answer keyThe resources above cover the following skills:
Earth/Space Science: Students will use scientific skills and processes to explain the chemical and physical interactions (i.e., natural forces and cycles, transfer of energy) of the environment, Earth, and the universe that occur over time.
Earth History: Explain how sedimentary rock is formed periodically, embedding plant and animal remains and leaving a record of the sequence in which the plants and animals appeared and disappeared.
Explain how sedimentary rock buried deep enough may be reformed by pressure and heat and these reformed rock layers may be forced up again to become land surface and even mountains.
Explain why some fossils found in the top layers of sedimentary rock are older then those found beneath in lower layers: Folding; Breaking; Uplift; Faulting; Tilting.