Circulatory System Flashcards
What do small and simple animals use
passive diffusion
simple animal circulatory system
gastrovascular cavity
three components of open and closed systems
A circulatory fluid
A set of tubules
A muscular pump
Open circulatory system
blood bathes the organs directly
there is no distinction between blood and interstitial fluid
arthropods, insects, and most molluscs
Open circulatory system fluid
hemolymph
closed circulatory system
blood is confined to vessels and is distinct from interstitial fluid
which system, open or closed, is more efficient
closed systems are more efficient at transporting circulatory fluids to tissues and cells
Blood Plasma
92% water
what solutes does blood plasma contain
nutrients, wastes, and hormones
Ions
Proteins
Ions in blood plasma
Na+, Cl-, and trace Ca2+, Mg2+, Cu2+, K+, and Zn2+
Proteins in blood plasma
Albumin, alpha and beta globulins, fibrinogen
what happens if fibrinogen is removed
plasma is called serum
Red Blood Cells
Erythrocytes
How many red blood cells per microliter of blood
5 million
Mature mammalian erythrocytes
lack nuclei
RBCs of vertebrates contain
hemoglobin