Circulatory System Flashcards
What type of circulatory system do arthropods and annelids have?
Arthropods = OPEN circulatory system
Annelids = CLOSED circulatory system
“Arthropods are open to helping Annelids close their stores”
Which side of the heart contains oxygenated blood?
LEFT SIDE = OXYGENATED
What is the duty of the AV valve (mitrial, bicuspid) opposed to the semilunar valve?
AV valve- prevents back flow into the atrium
Semilunar- prevents back flow into the ventricles
What does the Vagus nerve innervate the SA node to do?
vegas nerve is parasympathetic = slows contractions and increases digestion
What is systole opposed to diastole?
systole = ventricles contract
diastole = ventricles relax
What is the relationship between blood velocity and total cross-sectional area in blood vessels?
Blood velocity is INVERSELY proportional to total cross-sectional area
Which blood vessels have the greatest ability to constrict and the most resistance to flow?
Arterioles
What are lymph nodes?
o Lymphatic system is an open secondary circulatory system- transports excess interstitial fluids (lymph)
o Lymph nodes contain phagocytic cells (leukocytes) that filter the lymph and serve as immune response centers
Approximately how many liters of blood does the typical human have?
4-6L
What type of tissue is blood?
Connective tissue
What portion of the blood is liquid and what is another name for this liquid
55% of the blood is plasma (liquid)
What are erythrocytes?
RBCs that lack a nucleus just like platelets.
These RBCs contain hemoglobin that can hold up to
4 oxygens
What are leukocytes?
large WBCs that us phagocytosis
What is diapedesis?
process by which WBCs become part of interstitial fluid (slip through endothelium lining?
What converts fibrinogen to fibrin?
Thrombin
