Body factsHuman anatomy quiz
How many eyelashes are on the upper eyelid?
150-250. The number on the bottom eyelid is significantly lower - about 50-150.
How much skin do we lose each day?
1.5 g of the epidermis falls out of the body daily. Exfoliated epidermis feed mites and other microorganisms.
What is the shape do erythrocytes in human blood?
Oval biconcave disks. In humans, mature red blood cells are flexible and oval biconcave discs. They lack a cell nucleus and most organelles, in order to accommodate maximum space for hemoglobin; they can be viewed as sacks of hemoglobin, with a plasma membrane as the sack. Approximately 2.4 million new erythrocytes are produced per second in human adults.
What is the function of the pineal gland in the human body?
Helps in falling asleep. Located deep in the center of the brain, the pineal gland was once known as the “third eye.” The pineal gland produces melatonin, which helps maintain circadian rhythm and regulate reproductive hormones. Melatonin makes us sleepy.
What is laterality?
The preference for one side of the body over the other. The term laterality refers to the preference most humans show for one side of their body over the other. Examples include left-handedness/right-handedness and left/right-footedness. It may also refer to the primary use of the left or right hemisphere of the brain.
What is the only movable bone of the skull? (without the ossicles of the middle ear)
Mandible. The mandible is the largest, strongest and lowest bone in the human face. It forms the lower jaw and holds the lower teeth in place. The mandible is the only movable bone of the skull, not counting the ossicles of the middle ear.
Which part of their body do most people find impossible to lick?
Elbow. Try it!
How much percent of the water is in plasma?
90%. Plasma, a component of blood, is an aqueous solution.
How Much Water Is in the Human Body
50 - 75 %. The amount of water in the human body ranges from 50-75%. The average adult human body is 50-65% water, averaging around 57-60%. The percentage of water in infants is much higher, typically around 75-78% water, dropping to 65% by one year of age.