what are the three components of the cardiovascular system? - Answers a pump-the heart
a conducting system-blood vessels
a fluid medium-blood
what is the function of the cardiovascular system? - Answers to transport materials to and from
the cells
what materials does the cardiovascular system transport? - Answers -carbon dioxide and
oxygen
-nutrients
-hormones
-immune system components
-waste products
What is blood? List characteristics. - Answers -fluid connective tissue
-sticky, opaque fluid
-scarlet to dark red
-38 degrees celsius
-total volume=5L
-5x more viscous than water
-slightly alkaline
-8% of body weight
What is the composition of blood? - Answers plasma, erythrocytes, leukocytes, and platelets
Hematocrit - Answers -percent of blood volume that is RBC's
-about 47% for males and 42% for females
What are the functions of blood? - Answers -distribution of: oxygen and nutrients to cells,
metabolic wastes to lungs and kidneys, hormones to target organs
-regulation of: body temp, normal pH, and fluid volume in circulatory system
-Protection against: blood loss and infection
, What is blood plasma? - Answers -90% water
-55% of whole blood
-least dense component
-straw-colored and sticky
-contains proteins, nitrogenous byproducts, nutrients, electrolytes, respiratory gases, and
hormones
Hematopoiesis - Answers blood cell formation
Only _______ are complete cells. - Answers WBC's
_________have no nuclei or organelles. - Answers RBC's
________ are cell fragments. - Answers platelets
___________originate in bone marrow and do not divide. - Answers blood cells
Where does hematopoiesis occur? - Answers red bone marrow of axial skeleton, girdles, and
proximal epiphyses of humerus and femur
Hemocytoblasts - Answers -give rise to all formed elements
-hematopoietic stem cells
Erythrocytes - Answers -red blood cells
-anucleate, no organelles
-biconcave disc
-flexible plasma membrane
-major factor in contributing to blood viscosity
-slightly less the half the blood volume
red blood cell count - Answers the number of RBC's in 1 microliter of whole blood
Hemoglobin - Answers -95% of the proteins in RBC's
-always red
-binds reversibly with oxygen
Oxygen loading in the lungs - Answers produces oxyhemoglobin (ruby red)