Artificially acquired immunity is :
is a short-term immunization induced by the transfer of antibodies.
the defense system with which we were born.
immunity that develops with exposure to various antigens.
immunity is due to antibodies that are produced in a body other than our own.
What is the circulatory system?
The body's breathing system
The body's system of nerves
The body's food-processing system
The body's blood-transporting system
Which part of the human heart carries oxygenated blood?
Pulmonary artery
Hepatic portal vein
Pulmonary vein
Capillary artery
Define blood pressure.
Pressure which drives blood round the digestive system
Pressure which drives blood round the respiratory system
Pressure which drives blood round the nervous system
Pressure which drives blood round the circulatory system
Which element in the blood is round and colorless?
Plasma
Platelets
Red blood cells
White blood cells
The internal pacemaker that sets biological rhythms:
is located in the brain.
is located in the heart.
is located in the stomach
does not function in the absence of light or other environmental cues.
What is the function of blood platelet?
Transporting oxygen throughout the body
Fight of diseases or other pathogens that invade the body
Help the blood coagulate, or clot, when necessary
Allows it to flow freely through the various vessels
What is the organ that pumps blood all throughout the human body?
The lungs
The heart
The kidneys
The blood vessels and capillaries
Why does blood turn dark red as it circulates through the body?
It starts to clot.
It gets old and dirty flowing through the body.
The oxygen in it is replaced with carbon dioxide.
The farther blood is from the heart, the more dark red it is.
Normal human red cell:
are released into the circulation as immature cells called reticulocytes.
live for about 10 days.
rely on mitochondria for their ATP production.
are formed by budding off from large precursor cells called megakaryocytes.
