anatomy fun facts Flashcards
what bone can prove that humans once had tails but evolved
tailbone (coccyx)
what percent of bones are in feet
25%
what is the longest bone
femur
what and where is the smallest bone
stapes in the ear
what is the hardest part of the body
enamel teeth
how many muscles are in the body
600
what percent of body weight do muscles take up
40%
how many muscles does it take to smile
17
how many muscles does it take to frown
43
how many muscles does it take to stare
47
what is the largest muscle
gluteus maximus
what is the longest muscle
sartorius
how many lbs of force can jaw muscles provide for chewing
200 lbs
how much ATP does the body produce daily
70 kg
what percent of human dry weight comes from bacteria
10%
how long does it take nails to grow from base to tip
6 months
do fingernails or toenails grow faster
fingernails
how many strands of hair do people lose a day
40-100
how many hairs does the scalp have
100,000
do blondes or brunettes have more hair
blondes
how many ft of blood vessels are there in every inch of skin
20 ft
how much bacteria are on every square inch of the human body
32 million
how do fingerprints allow you to pick things up
they provide friction
how many particles are shedded every hour, how many pounds is that a year
600,000, 1.5 lbs a year
how often do humans shed and regrow outer skin cells
every 27 days
what is the surface area of skin
~25 ft^2
how long does the human head remain conscious for after decapitation
15-20 sec
about how large is the human’s scent membrane in the nose (comparison with an object)
about the size of a postage stamp
how much vision will you lose if you go blind in one eye
1/5
how much depth perception will you lose if you go blind in one eye
all of it
how heavy is the average brain
1.5 kg
who has slightly larger brains, men or women
women
what percent of water is the brain made up of
85%
how fast can nerves send impulses at
360km/hr
how many miles of nerves are in the skin
45 miles
how many different smells can the nose smell
2000-4000
how many different sounds can the ears detect
1500
how many colors can the human eye detect
10,000
how wide of an angle can you visualize
200 degrees
what is the maximum amount of time we blink a day (if it was all combined)
30 min
how long does it take a cell to make a complete circuit of the body
60 sec
how many times will your heart have beated by the time you turned 70
2 1/2 billion times
what is the most common blood type
o
what is the rarest blood type
ab
how many miles of blood vessels are there in the body
60,000 miles
how many liters of blood does the heart pump a day
27,949.3 liters
how many mph can a cough be released at
60 mph
how many mph can a sneeze exceed
100 mph
which lung is smaller, left or right
left
how much water do we drink in a lifetime
16,000 gallons
how many times does the average person use the bathroom a day
6 times
how many hours can a lab test detect traces of alcohol in urine after a person has stopped drinking
6-12 hours
what organs in the body don’t rest
the heart and kidneys
how much saliva is produced in a day
1.7 liters
how much gas does a healthy person release in a single flatulent emission. how much in a day
3.5 oz, 17 oz in a day
will someone die faster from starvation or sleep deprivation. how long do each take
sleep deprivation (takes ~10 days), but starvation takes a few weeks
like fingerprints, we also have unique ___
tongue prints
how long is the small intestine
22 ft
how much food does the average US citizen eat in a lifetime. how much do they drink
50 tons of food, 13,000 gallons of liquid
how much hypocaloric acid does the stomach produce daily
2 liters
how many stomach cells reproduce every minute and why
500,000 stomach cells. so the stomach walls aren’t damaged by the acid
how many bones are in a baby’s body vs adult
300 in babies, 206 in adults
one in every ___ babies are born with a tooth
2000
how long does pregnancy last (conception to birth)
~270 days
when does a fetus acquire fingerprints
3 months
what is the largest cell in the human body
ovum (egg cell)
what is the smallest cell in the human body
male sperm
how does laughing affect health
lowers stress hormones (cortisol) and strengthens the immune system
what in the endocrine system influences cells and function of our body
glands and the hormones they produce
name 4 important glands in the endocrine system
hypothalamus, pituitary, thyroid, adrenals
what does the pituitary gland secrete
growth hormones
where do adrenals sit on top of
the kidneys
more than __ major hormones are secreted by glands in the endocrine system
20
what signaling pathway is created from endocrine glands
endocrine signaling
how much fluid is returned each day from the tissues to the circulatory system
~3.17 quarts
what is the lymphatic system made up of
lymph vessels that carry lymph (a protein rich fluid that is transported through lymph vessels), and lymph nodes which filter out germs and toxins
how many lymph nodes are throughout the body
over 100
where are the majority of lymph nodes located
neck, groin, armpits
how are lymphs transported
through the lymphatic vessels and moves via squeezing action of neighboring skeletal muscles
what percent of the world is left handed
11%
1 out of every __ people in the world will die (in 2007)
113
how many people have the same bday as you
~10 million
how many calories are you consuming every time you lick a stamp
1/10
how many chromosomes do humans, peas, crayfish, and chimpanzees and potatoes have
46, 14, 200, and 48
how many words do women and men say a day
women say 20,000 words, but men say 7,000
the human body has enough fat to produce __ bars of soap
7
how many cells wear out and are replaced everyday
2 billion
what is the only bone not connected to another
hyoid
