Bio 1500 Lab 9 - Circulatory system
functions Mizzou Questions and
Answers.
open circulatory system - Answer - not confined to blood vessels
- hemolymph (not blood) > washing away nitrogenous waste
- heart pumps blood into a cavity called a hemocoel where it surrounds the organs and then
returns to the heart(s) through ostia (openings)
- Bathe tissues and provide nutrients/oxygen
- limits size of organism
closed circulatory system - Answer - confined to blood vessels and flows in a continuous
circuit
- blood is retained in vessels
- not in direct contact with tissues
- nutrients/oxygen must diffuse out of vessels then into cells
Single loop system - Answer - unidirectional flow of blood
- gradient of oxygenated blood to deoxygenated blood
- reducing the overall metabolic capacity
Double loop system - Answer - oxygenated blood is separated from deoxygenated blood
- 2 circuits: Lungs (pulmonary) and Heart (Systemic)
Mediastinum - Answer Region between the lungs
, Mediastinum contains: - Answer - heart
- trachea
- esophagus
about _____ of your heart rests on your diaphragm - Answer 2/3
Pericardium - Answer - Fibrous sac with serous lining surrounding the heart
- Anchors heart to other structures
- Lubricates heart for movement (contains a small amount of fluid)
- prevents the heart from overfilling
Cardiac wall - Answer 3 layers
- epicardium - outermost layer
- myocardium - cardiac muscle layer ; contracts
- endocardium - innermost lining of the heart
four chambers of the heart - Answer - Atria
- Left atrium (oxygenated)
- right atrium (deoxygenated)
- Ventricles
- Left ventricle (oxygenated)
- Right ventricle (deoxygenated)
Right Atrium - Answer receives deoxygenated blood from the body and heart; thinner than
ventricles
functions Mizzou Questions and
Answers.
open circulatory system - Answer - not confined to blood vessels
- hemolymph (not blood) > washing away nitrogenous waste
- heart pumps blood into a cavity called a hemocoel where it surrounds the organs and then
returns to the heart(s) through ostia (openings)
- Bathe tissues and provide nutrients/oxygen
- limits size of organism
closed circulatory system - Answer - confined to blood vessels and flows in a continuous
circuit
- blood is retained in vessels
- not in direct contact with tissues
- nutrients/oxygen must diffuse out of vessels then into cells
Single loop system - Answer - unidirectional flow of blood
- gradient of oxygenated blood to deoxygenated blood
- reducing the overall metabolic capacity
Double loop system - Answer - oxygenated blood is separated from deoxygenated blood
- 2 circuits: Lungs (pulmonary) and Heart (Systemic)
Mediastinum - Answer Region between the lungs
, Mediastinum contains: - Answer - heart
- trachea
- esophagus
about _____ of your heart rests on your diaphragm - Answer 2/3
Pericardium - Answer - Fibrous sac with serous lining surrounding the heart
- Anchors heart to other structures
- Lubricates heart for movement (contains a small amount of fluid)
- prevents the heart from overfilling
Cardiac wall - Answer 3 layers
- epicardium - outermost layer
- myocardium - cardiac muscle layer ; contracts
- endocardium - innermost lining of the heart
four chambers of the heart - Answer - Atria
- Left atrium (oxygenated)
- right atrium (deoxygenated)
- Ventricles
- Left ventricle (oxygenated)
- Right ventricle (deoxygenated)
Right Atrium - Answer receives deoxygenated blood from the body and heart; thinner than
ventricles
