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Functions of Blood
Transportation, regulation, and protection.
RBCs
biconcave dis-shaped structures without a nucleus
lifespan of about 120 days to 4 months
they carry oxygen around the body
Number 4.8 to 5.4 million
WBCs
White blood cells are larger than RBCs,
have a nucleus,
reproduce on their own
fight infections and microbes in the body
Number: about 5,000 to 10,000
Life span: for hours to days ~ decades
Platelets
Platelets are cell fragments without a nucleus lifespan of 5 to 9 days
involved in blood clotting and coagulation.
Number: about 150,000 to 400,000
Leukemia
WBC cancer, abnormal WBCs multiply uncontrollably
leukocytosis
increase in the # of WBCs >10,000
Leukopenia
decrease in the # of WBCs <5,000
Agranulocytes
Agranulocytes lack granules inside and include lymphocytes and monocytes
Monocytes and neutrophils
Neutrophils get there faster but are not as long-lasting as monocytes.
Monocytes are associated with chronic infections
Granulocytes
basophils, eosinophils, neutrophils
Plasma Proteins
Albumin (maintains osmotic pressure)
Globulins (backbone of antibodies)
Fibrinogen (involved in blood clotting)
Plasma
Plasma is the straw-colored liquid part of blood, making up 55% of blood and consisting of 91.5% water.
Hemostasis
Hemostasis is the process to stop bleeding in small cuts
Vascular spasm/vasospasm:
decrease blood vesse. contraction of blood vessels, called vasocontraction. We reduce the diameter of the blood vessel which reduces blood flow.
Platelet plug formation:
platelets strike damaged epithelial lining and collagen fiber, they begin to stick together and get larger and seal up the hole and pull it together.150,000 -400,000, 5-9 days, blood clotting
Coagulation
has three stages of cascading chemicals
a) Formation of prothrombinase.
b) protrombin→prothrombinase→thrombin.
c) fibrinogen→thrombin—>fibrin threads.
Blood Typing
Type A has A proteins on cell
Type B has B proteins on cell
Type AB has both AB proteins on cell
O does not have any proteins on cell
isoantibodies
Type A has anti-B in plasma
Type B has anti-A in plasma
Type AB does not have any in plasma
Type O has both anti-A and anti-B in plasma
compatibility
Type A: can receive Type A and O blood
Type B: can receive Type B and O blood
Type AB: can receive Type AB, A, B, O blood (universal receiver)
Type O: can receive Type O blood (universal donor)
hemolytic disease of fetus
if RH-positive man and RH-negative woman have baby that is RH-positive so mother makes anti-RH antibodies which could affect next RH-positive baby. Mother is given Rogam injections that blocks anti-RH.
Heart Coverings
The pericardium encloses and protects the heart with fibrous and serous layers.
Heart Wall Layers
The heart wall consists of the
epicardium: vessels larger of serous pericardium.
myocardium: cardiac muscle layer of heart, most substantial layer
endocardium: deep thin layer that lines the insides of chambers
Chambers - Atria
Atria: 2 smaller upper chambers (between right and left)
smooth inside
separated by interatrial septum
Pumps blood to ventricles (left to left, right to right)
Chambers - Ventricle
Ventricles: 2 larger lower chambers (right and left)
Separated by interventricular septum
Right ventricle: pumps blood to lungs
Left ventricle: pumps blood to rest of body through aorta
Valves
prevent backflow of blood so only moves in one direction
2 AV (atrioventricular) valves: between atria and ventricles
Right atrium to right ventricle: tricuspid valve
Left atrium to left ventricle: bicuspid or mitral valve
Pulmonary valve: right ventricle to pulmonary trunk
Aorta valve: left ventricle to aorta
Chordae tendinae
little strings, tendinous cords made of CT that attach from valve flaps of AV valves and anchor to the papillary muscles in ventricle
tricuspid and bicuspid valves ONLY
Prevent prolapse of AV valves that are under a lot of pressure
fossa ovalis
small depression in wall of right atrium in interatrial septum
Remnant of foramen ovale, hole in heart during fetal development that closes up
circulation through heart
right atrium → tricuspid valve → right ventricle → pulmonary valve → pulmonary trunk → lungs → left atrium → bicuspid/mitral valve → left ventricle → aortic valve → aorta → around body → right atrium
Conduction System of the Heart
Includes the SA node, AV node, AV bundle, right and left bundle branches, and Purkinje fibers.
Heart Sounds
Lubb = closure of AV valves (tricuspid and bicuspid valves) 1st sound closure.
Dupp = closure of semilunar valves (pulmonary and aortic valves) 2nd sound closure
abnormal heart sounds
heart murmer
EKG Waves
P-wave indicates atrial contraction/atrial depolarization/atrial systole,
QRS complex represents ventricular contraction/ventricular depolarization/ventricular systole
T-wave signifies ventricular relaxation/ventricular repolarization/ventricular diastole
Sympathetic vs parasympathetic
Sympathetic increases heart rate and force of contractions, uses neurotransmitter norepinephrine
Parasympathetic decreases heart rate and force of contractions, uses neurotransmitter acetylcholine
Agina Pectoris
chest pain associated with heart disease due to insufficiency of RBCs
Thrombocytopenia
Very low platelet count that results in a tendency to bleed from capillaries.
Polycythemia
the number of RBCs is abnormally high
Pernicious Anemia
insufficient hemopoiesis from inability of stomach to produce intrinsic factor, needed for absorption of vitamin B in the small intestine
Bicuspid valve prolapse
backflow of blood from the left ventricle into the left atrium,can cause mitral insufficiency. In MVP one or both cusps of the mitral valve protrude into the left atrium during ventricular contraction, when left av pushes back during ventricular systole
Vaso vasorum
blood vessels that supply blood vessels
tunica interna
deep layer of the blood vessels,
made of endothelium
Internal elastic tissue
Tunica media
middle layer of blood vessels,
made up of smooth muscle
External elastic tissue
Tunica externa
fibrous collagen tissue that supports it
elastic arteries
large conducting elastic arteries
Example: aorta
muscular arteries
distributing medium-sized arteries
Have more muscle tissue
Involved with vaso constrction and vaso dilation
Example: radial arteries, ulnar arterieries brachial arteries, femoral arteries,
Tibial arteries, etc (limb arteries)
arterioles
Carries blood from the medium-sized arteries to the capillary beds
capillaries
smallest microscopic blood vessels, major area of diffusion
fouund everywhere in the body except in epithelial tissue, cartilage, epidermis, and cornea of the eyes
veins
drain the blood from the capillary beds coming back to the heart
Have a thinner wall than an artery
NO elastic tissue
NO under pressure
YES valves, when arteries don’t have the valves
Vasoconstriction vs vasodilation
Vasoconstriction narrows blood vessels, while vasodilation widens them.
Physiologically Important Vessel
Capillaries
They don’t have the most blood in them but they are important bc all of our diffusion and active transport mechanisms take place
Where we give off nutrients and pick up waste products
Pulse and Blood Pressure
Radial artery is used to check the pulse, and brachial artery is used to check blood pressure.
blood pressure instrument
Sphygmomanometer
umbilical vein
placenta → fetus
umbilical arteries
fetus → placenta
ductus venosus
fetus circulation
bypasses the liver
ductus arteriosus
fetus circulation
pulmonary trunk → aorta
foramen ovale
fetus circulation
right atrium → left atrium
Respiratory System
Nose/nasal cavity area
Nasopharynx
Oropharynx (directly posterior to the oral cavity)
Laryngopharynx (most inferior part of the pharynx)
Larynx (voice box)
Trachea
Bronchi
Bronchioles
Terminal bronchioles
Respiratory bronchioles
Alveolar ducts
Alveolar sacs
functions of nose (3)
1. Warms, moistens and filters the air
2. Olfaction = sense of smell
3. Vocal resonance (sound of voice comes from the shape of the nose/nasal cavity, sinuses)
parts of nasal septum (3)
Perpendicular plate of ethmoid
Vomer
Septal cartilage
Epiglottis
moveable cartilage flap that seels off the larynx when we are swallowing so we don't aspirate liquids or solids into our respiratory system
thyroid cartilage
Adam’s apple which is largest cartilage structure. It is a landmark structure that lets us know where the larynx is
Cricoid cartilage:
first true cartilage ring that we feel below thyroid cartilage and it indicates junction of larynx and trachea.
Auditory tube
Also known as Eustachian tube, connects the nasopharynx to the middle ear for pressure equalization.
center for regulating normal respiration
Medullary rhythmicity center - found in medulla oblongata in brainstem - lowest most primitive part of the brain
center for conscious breathing
pons - allows us to take prolonged inhalation or exhalation or hold our breath.
chemical control center of respiration
Carbon dioxide is the main chemical control because as CO2 levels go up, our blood pH will go down. Blood has to have pH of 7.35-7.5 so if you hold your breath, you affect pH of blood which signals brain to breathe faster and get CO2 out and O2 in and shift pH levels.
hypoxia
medical term for a decrease delivery or availability of oxygen to tissues
Anemic hypoxia
Type of hypoxia due to decreased functional red blood cells affecting oxygen transport.
stagnant hypoxia
oxygen and RBC is available but there is something going on with the cardiovascular system so can’t pump blood to lungs or out the aorta to the rest of body
Ex: heart attack, major blood loss,
histotoxic hypoxia
inability of cells to use oxygen
Ex: cyanide poisoning which blocks the cells from using oxygen
hypoxic hypoxia
decreased availability of oxygen due to decreased availability of oxygen
High altitude which has less oxygen
Lymph vessels
like veins, thinly muscled walls, have valves, do NOT transport lymph anywhere, pick lymph from capillary beds and carry it back to bloodstream, returning leaked intercellular fluid and plasma proteins out cleansing it and returning it to blood
lymph
fluid interstitial intercellular fluid found in lymph vessels
lymph structures and organs
spleen (largest lymphatic tissue), thymus gland, lymph nodes, tonsils, diffuse loose lymphatic tissue in digestive system, bone marrow
function of lymph
Cleanses and returns leaked plasma proteins from capillary beds back to blood,
Cleanses and returns interstitial plasma fluid back to bloodstream
transportation of dietary fats,
Protection and immunity in both specific and non-specific immune resistance - involved in manufacture of WBCs
methods of non-specific disease resistance
Mechanical
chemical
Antimicrobial agents
Phagocytosis: eating cells
Natural Killer (NK) Cells
Inflammation
Fever
Mechanical disease resistance
skin, intact mucous membranes, epiglottis, urination, defecation
chemical disease resistance
sebum on skin, acids in vagina, lacrimal apparatus (tears), gastric juice, lysozyme (bacterial enzyme in tears)
IgG
Antibody class involved in protecting against bacteria and viruses by enhancing phagocytosis.
IgA
found in secretions of body - tears, saliva, mucous, breastmilk, blood
IgM
involved in causing microbes in agglutination and cytolysis (punching hole in cell membrane)
IgD
activates more B-cells to be converted into plasma cells to make more antibodies
IgE
found on outside of mass cells or basophils and involved in allergic reactions
T cells
directly attack the foreign invaders, develop from the thymus gland
Helper T Cells
Cytotoxic T Cells
Memory T cells
B-cells
produce antibodies to attack the foreign proteins, develop from the gut and spleen, and differentiate into plasma cells
Memory cells
BOTH T and B cells produce MEMORY CELLS are programmed to recognize the original antigen, with a SECOND EXPOSURE there is a faster reaction time, conferring immunity
Helper cells
When a person is infected with HIV(human immunodeficiency virus), it will affect and infect helper cells, preventing both T cells and B cells from functioning properly
structure of antibody
Y-shaped protein substances that have a pair of heavy chains and a pair of light chains
Constant portion
determines the antibody class (IgA, IgG, IgM, IgD, etc)
Variable portion
antigen-binding site(ABS) is found on the tip of the variable portion, which changes to match each specific antigen (foreign protein) the antibody is exposed to
dyspnea
Difficulty or labored breathing, shortness of breath
bradycardia
Abnormally slow heart rate, typically below 60 beats per minute
tachycardia
Abnormally fast heart rate, generally above 100 beats per minute