Body Systems L6 Flashcards
What are the substances transported by the circulatory system?
- O2
- Nutrients
- CO2
- Metabolic waste
- Cells of immune system (White blood cells)
- Hormones
Name the types of circulatory system.
Blood
Specialised
Lymphatic
Describe the characteristics of the blood circulatory systems.
Closed circuit
Arteries -> Away from heart
Veins -> Back to heart
Capillaries -> Between arteries & veins -> site of gas exchange
Name the types of blood circulatory systems
Systemic
Pulmonary
Coronary
Describe the systemic circulatory system
High pressure -> arterial
Transports oxygenated blood -> LHS heart -> body tissues
Returns deoxygenated blood – RHS heart
Describe the characteristics of the arteries & veins
Typically identical RHS & LHS distribution
Corresponding arteries & veins -> same path
Vessels have multiple names/ change name based on the section of the body in which the vessel is being referred to-> anatomical accuracy
Tissues & organs served -> anastomoses -> unions -> several arteries & veins.
Term for the area of the Head
Cephalic
Term for the area of the neck
Jugular
Term for the area of the arm
Brachium
Term for the area of the back of knee
Popliteal fossa
Term for the area of the arm pit
Axillary fossa
Term for the bone in the area of the collar bone
Clavicle
Term for the bone in the area of the (lateral) forearm
Radius
Term for the bone in the area of the (medial) forearm
Ulna
Term for the bone in the area of the hip
Ilium
Term for the bone in the area of the top of the leg
Femur
Term for the bone in the area of the (medial) lower leg
Tibia
Term associated with arteries/veins of the shoulder
Axillary
Term associated with arteries/veins of the upper arm
Brachial
Term associated with arteries/veins of the lateral lower arm
Radial
Term associated with arteries/veins of the medial lower arm
Ulnar
Term associated with arteries/veins of the hip area of the leg/lower hip
External iliac
Term associated with arteries/veins of the upper leg area
Femoral
Term associated with arteries/veins of the back of the knee
Popliteal
Term associated with arteries/veins of the lower leg
Tibial
Term associated with arteries of the right of the neck
Right common carotid
Term associated with arteries of the left of the neck
Left common carotid
Term associated with arteries of the lungs
Brachiocephalic trunk
Term associated with arteries of the right area under collarbone
Right subclavian
Term associated with arteries of the left area under collarbone
Left subclavian
Term associated with arteries of the main part of heart
Aortic arch
Term associated with arteries of the area of the lower spinal section of ribcage
Descending thoracic aorta
Term associated with arteries of the area of the abdominal
Abdominal aorta
Term associated with arteries/veins of the top of hip
Common iliac
Term associated with arteries/veins of the lower hip/top of leg
External iliac
Term associated with arteries of the backbone
Internal iliac
Term associated with the veins of the left of neck
Internal jugular
Term associated with the veins of the LHS top of heart
Left brachiocephalic
Term associated with the veins of the RHS top of heart
Right brachiocephalic
Term associated with the veins of the main part of heart
Superior vena cava
Term associated with the veins of the area under collarbone
Subclavian
Term associated with the veins of the abdomen
Inferior vena cava
Term associated with the veins of the arms & legs (many)
Superficial
Describe the pulmonary circulatory system
Low pressure
Deoxygenated blood -> RHS heart -> lungs
Oxygenated blood -> Lungs -> LHS heart
Pulmonary arteries -> Low O2
Pulmonary veins -> High O2
Describe the direction of blood circulation in terms of circuits.
• Blood Circulation: 1. Pulmonary circuit: Oxygenated Lungs -> LHS heart -> Organs & tissues -> Capillaries 2. Capillaries 3. Systemic circuit: Deoxygenated Capillaries -> RHS heart -> Lungs
Describe the stages of vessel in systemic circulation
Artery -> capillary -> vein
Describe the stages of vessel in portal circulation
Artery -> capillary -> portal vessel
-> capillary -> vein.
Describe the stages in portal circulation, with examples of where this occurs.
- Blood drains -> one capillary bed
->Vein -> 2nd capillary bed
->Heart.
Eg. Hypophyseal portal system
Hypothalmus -> pituitary gland
Eg. Hepatic portal system
Gastrointestinal tract -> liver.
Describe the stages in the hepatic portal system
Hepatic portal system:
Liver:
Oxygenated blood -> LHS heart -> Abdominal aorta
-> Hepatic artery
Liver -> respiring cells
Deoxygenated blood -> RHS heart
-> Inferior vena cava (IVC)
1st Capillary beds:
Oxygenated blood -> LHS heart ->1st capillary beds
i) Stomach, pancreas, spleen & large intestine
ii) Splenic vein -> Hepatic portal vein.
iii) Small & large intestines, stomach
iv) SMV-> hepatic portal vein -> liver
Nutrients from 1st capillary beds deposited -> liver
CO2 from liver collected -> blood from 1st capillary beds
Deoxygenated blood -> RHS heart -> hepatic vein.
Route from the LHS heart to the capillary beds in hepatic portal system?
LHS heart -> Abdominal aorta -> Hepatic artery 1st capillary bed i) Stomach, pancreas, spleen & LI ii) SI, LI & stomach 2nd capillary bed (Liver)
Route from the 1st capillary bed to the heart?
1st capillary bed
i) Stomach, pancreas, spleen & LI
-> Splenic vein -> Hepatic portal vein
ii) SI, LI & stomach -> SMV -> Hepatic portal vein
>Hepatic portal vein -> Liver (2nd capillary bed)
-> Hepatic vein -> Heart.
Describe foetal circulation
Foetal circulation:
- Specialised
- Lungs, liver & GI tract -> not sufficiently developed -> foetus
- > Bypassed.
Name the components if lymphatic circulation system
- Network lymphatic vessels
- Lymph
- Lymphatic tissues & organs
What is the role of the lymphatic circulation system
Defence mechanisms
Drains interstitial fluid
Describe how excess interstitial fluid is removed
- Fluid -> out of capillary-> interstitial space -> arterial end of capillary
- Fluid -> into capillary -> venous end of capillary
15% fluid remains -> interstitial space
->Enters lymphatic system -> lymphatic capillary -> becomes lymph
->Returned to blood
What are lymph capillaries?
- Lymph capillaries -> Blind-ended tubes
- > adjacent -> capillary beds
Outline the process of lymphatic drainage
Lymphatic drainage:
Lymph capillaries -> Lymph vessels -> Lymph nodes -> Lymph trunks
i) Thoracic duct
ii) Right lymphatic duct
Outline what parts of body undergo lymphatic drainage in certain places?
Lymphatic drainage: - RHS head, neck , thorax & upper limb Right lymphatic duct Right subclavian vein - Rest of body Thoracic duct Left subclavian vein
What are lymph nodes?
• Lymph nodes:
- Encapsulated aggregations -> lymphocytes
-> along lymphatic vessels
- Filter lymph & trap foreign particles
Some particles -> destroyed by macrophages
What do lymphocytes do?
• Lymphocytes
Initiate various immune responses.
Name the types of circulation in animals
Open
Closed
Double
Single
Describe a closed circulatory system, what animals it is found in & why it is beneficial.
Closed system
Blood separated -> interstitial fluid & lymph -> blood vessels.
»_space;Transfer nutrients & oxygen -> blood plasma must exit capillaries to enter interstitial fluid.
Higher pressure
»_space;Found -> larger animals -> require higher pressure to pump blood large distances -> therefore closed system.
Describe an open circulatory system, what animals it is found in & why it is beneficial.
Open system
Blood -> (haemolymph) -> travels through blood vessels -> series interconnected tissues -> directly bathes cells.
No veins transport haemolymph back -> heart.
Lower pressure
»_space; Open system only efficient -> distance travelled -> haemolymph -> short
»_space;>Small animals -> insects.
Describe a double circulatory system, what animals it is found in & why it is beneficial.
- Single vs. double circulation:
Double circulation:
Blood passes through heart twice -> complete 1 full circuit -> body.
Describe a single circulatory system, what animals it is found in & why it is beneficial.
Single circulation:
Process:
»_space; Blood leaves heart -> passes through gills -> oxygenated.
»_space; Circulates body -> delivers oxygen to tissues
»_space; Returns -> heart -> venous system.
Advantage
-> Simple heart structure -> 1 atrium & 1 ventricle
Disadvantage
-> Blood must pass through 2 capillary beds -> (gills & peripheral tissues)
before returning -> heart.
>Very low blood pressure.
»_space;Limits availability -> oxygen.
Describe the circulatory system in amphibians
Double circulation
Amphibians -> 3 chambered heart
Describe the circulatory system in reptiles
Double circulation
Reptiles -> hole between ventricles
»_space;Can be opened -> movement of blood from RHS->LHS of heart.
Describe the circulatory system in birds & mammals.
Birds & mammals:
4 chambered heart
»_space;Blood pumped through lungs -> oxygenated -> heart -> expelled at high pressure -> respiring cells.
»_space;>Blood delivered -> lungs -> low pressure
-> slow movement -> maximal exchange -> oxygen
& delivered -> body -> high pressure.