1
BIOS255 - Exam 1 Review Questions
and Answers (100% Correct
Answers) Already Graded A+
What are the functions of Circulatory System? Ans:
Transportation: Blood carries oxygen, carbon dioxide,
© 2026 Assignment
nutrients (from the digestive tract), hormones, heat, and
metabolic wastes.
Guru01 - Stuvia
Regulation: Components of this system regulate homeostasis
Expert
of all body fluids (managing the volume and distribution),
maintain the pH of extracellular fluids, and help regulate body
temperature and metabolic heat.
Protection: The circulatory system plays several roles in
inflammation to limit the spread of infection, contains cells
and proteins that destroy pathogens or remove tissue debris,
and initiates blood clotting to minimize blood loss and
maintain blood vessel structure.
What happens In the presence of Ca2+ Ans: In the presence
of Ca2+, factor X combines with factor III and produces the
enzyme prothrombin activator. This converts a plasma protein
called prothrombin to thrombin. Thrombin is an enzyme that
will convert fibrinogen to fibrin.
How blood flows through the heart? Ans: Blood flow through
the heart starts with deoxygenated blood entering the right
atrium from the body. It moves to the right ventricle, which
pumps it to the lungs via the pulmonary artery. Oxygenated
blood returns to the left atrium, moves to the left ventricle,
and is then pumped through the aorta to the rest of the body.
BIOS255 - Exam 1 Review Questions
and Answers (100% Correct
Answers) Already Graded A+
What are the functions of Circulatory System? Ans:
Transportation: Blood carries oxygen, carbon dioxide,
© 2026 Assignment
nutrients (from the digestive tract), hormones, heat, and
metabolic wastes.
Guru01 - Stuvia
Regulation: Components of this system regulate homeostasis
Expert
of all body fluids (managing the volume and distribution),
maintain the pH of extracellular fluids, and help regulate body
temperature and metabolic heat.
Protection: The circulatory system plays several roles in
inflammation to limit the spread of infection, contains cells
and proteins that destroy pathogens or remove tissue debris,
and initiates blood clotting to minimize blood loss and
maintain blood vessel structure.
What happens In the presence of Ca2+ Ans: In the presence
of Ca2+, factor X combines with factor III and produces the
enzyme prothrombin activator. This converts a plasma protein
called prothrombin to thrombin. Thrombin is an enzyme that
will convert fibrinogen to fibrin.
How blood flows through the heart? Ans: Blood flow through
the heart starts with deoxygenated blood entering the right
atrium from the body. It moves to the right ventricle, which
pumps it to the lungs via the pulmonary artery. Oxygenated
blood returns to the left atrium, moves to the left ventricle,
and is then pumped through the aorta to the rest of the body.
