Lecture: Blood Flashcards
Blood
What 2 systems does the circulatory system create?
The cardiovascular and lympathic
When does the circulatory system begin to form?
toward the end of the third week of intra-uterine life
When does the heart start beating?
4 weeks
What is the critical period of heart development?
from day 20 to day 50 after fertilization
What does the cardiovascular system comprise of?
The heart (pump), blood vessels (conducting tubes), and blood
Why is blood a connective tissue?
3 classifications:
cells – RBCs WBCs,
fiber – fibrin
matrix – plasma
What causes blood to be red?
Hemoglobin in Red Blood Cells
Oxygenated blood differs how in color?
It is a brighter red color
What is the normal temperature of blood?
38°C (100.4°F)
Compare the viscosity of blood to water
Blood is 5x more viscous than water
What is the pH of blood?
7.35-7.45
How much blood does an adult male have?
5- 6 liters (80-85 ml/kg of body weight)
How much blood does an adult woman have?
4-5 liters
What percent of body weight in kg is blood?
7%
The function of blood is to transport ____________________?
transports nutrients, gases, hormones and metabolic wastes
The function of blood is to regulate ____________________?
regulates pH and ions (Hydrogen ion & electrolytes)
The function of blood is to restrict ____________________?
restricts fluid losses at injury sites (Hemostasis)
The function of blood is to defend against ____________________?
defends against toxins and pathogens (Immunity)
The function of blood is to stabilize ____________________?
Stabilizes body temperature (By dilatation and constriction of vessels (Absorbs heat generated from skeletal muscles, if too high- releases through skin)
What percentage of blood is plasma?
55%
What percentage of plasma is water?
92% of plasma is water
What percent of plasma is protein?
7%
What percent of blood is formed elements?
45%
What makes up the formed elements in blood?
erythrocytes, leukocytes, platelets