Studied by 46 PeopleTags & Description
plural fluid
clear fluid that minimizes friction between the tissues and provides surface tension in pleural cavity
surfactant
chemical substance secreted by lungs to facilitate surface tension (prevents collapse of alveoli)
tidal volume (TV)
amount of air moving in and out of the lungs during normal breathing
average = 500 ml
inspiration reserve volume (IRV)
amount of air that can be inhaled after normal inspiration
average = 3000 ml
calculated IRV = IC - TV
expiratory reserve volume (ERV)
amount of air that can be exhaled after normal expiration
average - 1100 ml
inspiratory capacity (IC)
total amount of air that can be inhaled
average = 4000 ml
calculated IC = VC - ERV
vital capacity (VC)
total amount of air that can be exhaled
average = 5000 ml
calculated VC = TV + IRV + ERV
residual volume (RV)
amount of air that is always left in the lungs after expiration
average = 1200
total lung capacity (TLC)
total amount of air that the lungs contain, including residual volume
average = 6000 ml
calculated TLC = VC + RV
anatomic dead space
amount of air remain in the bronchial tree that is not involved in gas exchange due to obstruction of air flow/damage to bronchial tree
physiologic dead space
total amount of air in the lungs that is not involved in gas exchange (i.e. anatomic dead space + alveolar dead space)
4 major factors that affect normal breathing...
stretching in the lungs and thoracic walls
O2 levels in blood
CO2 levels in blood
H+ levels in blood
The respiratory centers is made up of the...
pons and medulla oblogata
pulmonary capillaries
high to low (O2 enters/ CO2 enters alveoli)
systemic capillaries
high to low (O2 enters tissues/ CO2 enters capillary)
main factors that can shift the O2-Hb dissociation curve...
O2 pressure
CO2 pressure
pH of blood
body temp
____ in O2 pressure shifts curve to the right.
decrease
____ in CO2 pressure shifts curve to the right
increase
____ shifts the curve to the right
more acidic
increase in ___ shifts the curve to the right
body temperature
bolus
moist lump of food particles and saliva created from mastication for easier passage into pharynx
Name the 4 types of teeth...
incisors
canines
premolars
molars
function of incisors
cutting
function of incisors
tearing
function of premolars
crushing
function of molars
grinding
amylase
enzyme that digests carbohydrates
What are the 4 gastric secretory cells?
chief cells
parietal cells
mucous cells
G cells
chief cells
secrete pepsinogen
parietal cells
secrete HCl and intrinsic factor
mucous cells
secrete mucus and alkaline substances to help neutralize HCl in gastric juice
G cells
secrete gastrin which stimulates the parietal cells and overall gastric secretion
gastrin hormone
stimulates the gastric glands for more activities
intestinal gastrin
hormone that inhibits other gastric activities
secretin
hormone that inhibits gastric acid secretion in response to fat in chyme
trypsinogen
activated by enterkinase into trypsin which activates 3 other enzymes
Name the 2 duodenal hormones that influence pancreatic secretion
secretin
cholecystokinin
secretin
stimulates the secretion of pancreatic electrolyte - rich fluid
cholecystokinin
released by intestinal wall cells
enhances the enzymatic secretions of the pancreas
peritubular capillaries
same as vasa recta, found around nephron
What are the 4 forces of filtration?
glomerular capillary hydrostatic pressure
capsular osmotic pressure
capsular hydrostatic pressure
glomerular capillary osmotic pressure
afferent arteriole
brings blood to the glomerulus to be filtered (GFR drops when constricted)
efferent arteriole of glomerulus
brings filtered blood out of the glomerulus (GFR will increase when constricted?)
preritubular capillary
capillaries that surround tubule, adapted for reabsorption
pyuria
large white blood cells (leukocytes) that are present in urine, cause by glomerulus's nephritis, UTI, or strenuous exercise
intracellular fluid
25 L of fluids (63%) are located inside body cells
mostly water and rich in K+, Mg++, HPO4-2, SO4-2, and protein anions
extracellular fluid
15 L of fluids (37%) are located outside of body cells
contains more Na+, Cl-, HCO3-, and Ca++
Most water is absorbed in the ___
large intestines
Most important electrolytes
Na+, Cl-, K+, Ca++, HPO42-
Na+ (electrolyte)
most abundant extracellular cation
Cl- (electrolyte)
major extracellular anion
K+ (electrolyte)
most abundant cation
Ca++
most abundant ion
HPO42-
important intracellular anion
chemical buffer system
acts rapidly, first line of defense against pH shift
physiological buffer
acts slowly, second line of defense against pH shift
respiratory acidosis
due to deficiency of CO2 expiration
respiratory alkalosis
due to abnormally high CO2 expiration
acid-base buffer systems
prevents rapid, drastic changes in body fluid pH
secondary messenger
product of cascade reactions, usually cyclic adenosine monophosphate or cAMP
nontropic hormones
hormones that are secreted by endocrine glands and travel to target cells directly
tropic hormones
hormones that are secreted by an endocrine gland and travels to another endocrine gland, causing the second gland to secrete another hormone
5 types of glandular cells
somatotrophs
lactotrophs
corticotrophs
thyrotrophs
gonadotrophs
somatotrophs
produce GH
lactotrophs
produce PRL
corticotrophs
produce ACTH and MSH
thyrotrophs
produce TSH
gonadotrophs
produce FSH and LH
lutheinizing hormone (LH)
triggers ovulation and stimulates the production of estrogens and progesterone in female, and promotes testosterone production in male
growth hormone is secreted by...
anterior pituitary
releasing hormone is from...
hypothalamus
follicle stimulating hormone (FSH)
stimulates production of egg cells and sperm in the gonads
placenta produces estrogen and progesterone...
after 1st trimester
cholecytokinin (CCK)
secreted by small intestine to stimulate gallbladder activities
corpus luteum produces estrogen and progesterone...
during 1st trimester
parturition
means “giving birth”
seminal vesicles
secrete an alkaline solution that makes up 60% of semen volume
Dilation of the vagina is a ___ response in both male and female.
parasympathetic
Orgasm in a ___ response in both male and female.
sympathetic
corpus luteum
maintains pregnancy
zygote
a single diploid cell