PLEASE HELP I'll MARK THE BRAINLIEST1.) A vessel that carries oxygen-rich blood to the heart muscle is called a(n): *

A.) Coronary Artery

B.) Vein

C.) Ventricle

D.) Atrium


2.) A group of cells that receives messages about the body's oxygen needs and sends out signals to adjust the heart rate is called the: *

A.) Atrium

B.) Lymph Node

C.) Valve

D.) Pacemaker


3.) Blood components that helps the body control bleeding are: *

A.) Hemoglobin

B.) Red Blood Cells

C.) White Blood Cells

D.) Platelets


4.) Plasma is mostly composed of: *

A.) Blood Cells

B.) Water

C.) Proteins

D.) Hemoglobin


5.) Which of the following is NOT a characteristic of a vein? *

A.) Valves prevent backward flow of blood

B.) Returns blood to the heart

C.) Walls are one cell thick

D.) Walls are generally thinner than those of arteries


6.) The largest artery in the body is called the: *

A.) Aorta

B.) Atrium

C.) Pacemaker

D.) Coronary Artery


7.) The network of vessels that returns fluid to the bloodstream is called the: *

A.) Lymphatic System

B.) Veins

C.) Arteries

D.) Circulatory System


8.) Hemoglobin is a protein that binds easily to: *

A.) White Blood Cells

B.) Oxygen

C.) Fibrin

D.) Platelets


9.) Which of the following structures pumps blood into arteries leading to the lungs? *

A.) Right Atrium

B.) Left Atrium

C.) Right Ventricle

D.) Left Ventricle


10.) Which of the following structures is NOT part of the cardiovascular system? *

A.) Heart

B.) Blood Vessels

C.) Brain

D.) Blood


11.) True/False: The force of the heart's contracting atria causes blood pressure. *

A.) True

B.) False


12.) True/False: Capillary walls must be very thick to withstand the high force of blood pumped by the heart. *

A.) True

B.) False


13.) True/False: White blood cells defend the body against disease. *

A.) True

B.) False


14.) True/False: Blood travels in two directions in the body. *

A.) True

B.) False


15.) True/False: Blood types are determined by proteins known as marker molecules that are on red blood cells. *

A.) True

B.) False


16.) Fill in the Blank: The right and left __________________ are the two lower chambers of the heart. *


17.) Fill in the Blank: A sphygmomanometer is an instrument that measures ____________________________. *


18.) Fill in the Blank: A flap of tissue that prevents blood from flowing backward is a(n) ______________. *


19.) List two of the three main roles of the cardiovascular system: *


20.) Tell me anything else that you learned in science about the cardiovascular system:

20. Which of the following is an example of homeostasis?A human participates in vigorous activity on a hot day and eventually suffers from dehydration.
A human body loses too much heat on a cold day, and hypothermia occurs.
A cactus stores water during wet periods, allowing it to live through dry periods.
A snake rests in the sun on a summer day, and its body temperature eventually becomes too hot for survival.

True or False: Only the Moon’s gravity affects the tides because the Sun is too far away from the Earth to cause any change.

What evidence have you discovered to explain some ways that different types of animals are provided with structure and support?????

Explain why convection happens more efficiently in water or air than it does in rock

How do plants get energy? (Cut out project) ​

Please help!!Which gas is most abundant in earth’s atmosphere?
A.
oxygen

B.
nitrogen

C.
carbon dioxide

D.
methane