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Z-Biology > Chapter 27- Blood > Flashcards

Chapter 27- Blood Flashcards

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1
Q

What percentage of blood is formed elements?What percent of whole blood is plasma?

A

Plasma 55%

Formed elements- 45%

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2
Q

What is the plasma made up of?

A

7% proteins

  • albumins 57% - maintain osmotic balance (pressure)
  • Globulins 38% (ANTIBODIES) protect against antigens
  • fibrinogens 4% (CLOTTING)
  • prothrombin 1% (CLOTTING)

91% water

2% other solutes

  • ions
  • nutrients
  • waste products
  • gases
  • regulatory substances
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3
Q

What are the formed elements in blood?

A

1% platelets

99% erythrocytes

1% leukocytes

  • neutrophils 60%-70
  • lymphocytes 20-25
  • monocytes 3-8
  • eosinophils 2-4
  • basophils .5-1
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4
Q

What is the purpose of the blood?

A

Media of transportation

Heat regulation

Connective proposes

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5
Q

What are the main characteristics of red blood cells?

A

Have no nucleus

Carry hemoglobin

Very few organelles (for structure and shape)

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6
Q

What is the purpose of red blood cells?

A

Carry oxygen and carbon dioxide (general has exchange)

(Outnumber white blood cells 1000:1)

4-6 million per mm3

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7
Q

What is the the purpose of hemoglobin and how does it work?

A

Each RBC has 200-300 million hemoglobin globular molecules

4 iron containing heme groups(4 O2 or CO2 binding sites)

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8
Q

What is the normal range for hemoglobin?

A

140-180 g/L (slightly lower in females)

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9
Q

What are the two disorders relating to hemoglobin?

A

Anemia- low hemoglobin

Polycythemia- high hemoglobin (disease, respiratory disorder, cancer)

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10
Q

What are the two types of leukocytes and their subdivisions?

A

Granulocytes

  • neutrophils
  • eosinophils
  • basophils

Agranulocytes

  • lymphocytes
  • monocytes
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11
Q

What is the main function of leukocytes?

A
  • Defence against disease
  • complete cells with nucleus and organelles
  • able to move in and out of blood vessels
  • respond to chemical released by damaged tissues
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12
Q

What is the normal leukocyte level and what are abnormal levels called?

A

Normal level- 4000 and 11000 cells per mm3

Leukocytosis- high. Indicates infection

Leukopenia- low. Indicates disease

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13
Q

What are neutrophils and how do they work? What are their characteristics?

A

Type of granulocyte

  • most numerous leukocyte (65%)
  • 3-7 lobed nucleus
  • highly mobile phagocytic cell to fight off bacterial and fungal infections

Increase during infection

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14
Q

What are basophils and what are their characteristics?

A

Bilobed nucleus

Found in mucous lining of respiratory and digestive tract

Release chemicals in response to allergies and parasitic worms

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15
Q

What are basophils and what are their characteristics?

A

Type of granulocyte

Least numerous 0.5-1% of leukocytes

U or S shaped nucleus

Granules contain histamine- released in response to inflammation or allergic reaction

  • cause vasodilation (wider veins) > contraction of smooth muscles> capillary walls become permeable to leukocytes to fight reaction

Also contain HEPARIN- anticoagulant to stop clotting

3-7 days to develop

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16
Q

What are lymphocytes and what are their characteristics?

A

Agranulated leukocyte

Second most numerous leukocyte 25%

Lymph system- immune response to VIRAL INFECTIONS

Large nucleus fills most of cell

Divided into T cells (attack infections directly) and B cells (produce antibodies against specific antigens)

Takes 1-2 days to develop

17
Q

What are monocytes and what are their characteristics?

A

Type of Agranulocytes

Largest leukocyte

Kidney shaped nucleus

Clean up dead tissue in liver, lungs, lymph fluid and more

Fight CHRONIC infections

18
Q

What are thrombocytes and what are some characteristics?

A

Crucial for clotting (hemostasis)

Normal count 300,000/mm3

19
Q

What is the process of making blood cells called?

A

Hematopoiesis

Come from common stem cell hemocytoblast

20
Q

How long is the RBC life cycle?

A

100-120 days before macrophage breaks cells down into various biologically useful elements

21
Q

What are the three phases of hemostasis?

A
  • vascular spasm
  • platelet plug formation
  • coagulation
22
Q

Describe stage 1 of hemostasis

A

Vascular spasm

Injury detected> vasoconstriction of blood vessel to stop blood loss

Platelets release serotonin which causes blood vessel to spasm and constrict, attracts more platelets

23
Q

Describe step 2 of hemostasis

A

Collagen fibres are exposed by break of blood vessel

Injured tissue releases THROMBOPLASTIN (acts as clotting factor to initiate coagulation cascade)

Within 1-5 seconds platelet plug will form

Platelets become stick and cling to exposed collagen fibres (temporary platelet plug)

Platelets secrete serotonin which makes them sticky and attracts more

24
Q

Describe step 3 of hemostasis

A

Clotting cascade starts with PROTHROMBIN ACTIVATOR

prothrombin interacts with calcium to convert to thrombin

Thrombin interacts with FIBRINOGEN to produce FIBRIN (a fibrous gel that forms mesh like structure that captures RBC to form clot)

25
Q

How long does blood clot usually take? How long does it stay?

A

Usually takes 3-6 minutes

Clot remains on skin until ENDOTHELIUM regenerates

26
Q

What is prothrombin time?

A

Measure how long it takes blood to clot

27
Q

What is partial thromboplastin time?

A

Detect abnormalities in the blood clotting. Measure effects using heparin

28
Q

What is thrombin time?

A

Measure of the time it takes for a clot to form I’m a sample containing anticoagulants after and excess of thrombin has been added

29
Q

How long does it take to make thrombocytes? How long do they stay?

A

4-5 days to develop. Last 8-12 days

30
Q

How long does it take to make monocytes? How long do they stay?

A

2-3 days to develop. Last months to years

31
Q

What are the three proteins in plasma?

A

Albumins

Globulins

Clotting proteins (prothrombin and fibrin)

32
Q

How long does it take to make neutrophils? How long do they last?

A

-6-9 days to develop. Last 6hrs-few days

33
Q

How long does it take to make eosinophils? How long do they last?

A

6-9 days to develop. Last 12 days

Z-Biology (13 decks)

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