Bodily Bits ‘N’ Bobs

What is the purpose of hairs standing up when a cat or dog gets scared?

What is the human body's reaction when scared or cold?

What is the function of alternating nostrils throughout the day?

How many muscles are there in the human tongue?

Which part of the body contains the fastest muscles?

What is the approximate ratio of the length of the femur to a person's height?

What is unique about the patterns in a person's iris?

What can be derived by multiplying the circumference of a person's head by 3?

What is the significance of fingerprints to each person?

What can be determined by stretching one's arms out and measuring the distance between the tips of the two middle fingers?

Animal Reactions to Fear

When a cat or dog gets scared, their hairs stand up, this serves as a physical intimidation tactic and helps them appear larger to a predator.
The same instinct is what causes humans' hair to stand up when cold or scared, known as piloerection.

Human Body Functions

The human body alternates nostril usage throughout the day to improve airflow and allow each side to rest and recover.
We have approximately 16 muscles in our tongue, making it one of the most agile muscles in the body.
The fastest muscles in the human body are the eye muscles, allowing for incredibly quick and precise movements.

Human Body Proportions and Unique Features

The femur, or thigh bone, is approximately one-quarter the length of a person’s total height.
The intricate patterns in a person's iris, known as the iris structure, are unique to each individual, similar to fingerprints.
Multiplying the circumference of a person's head by 3 generally approximates their height.
Fingerprints are unique to every individual, a feature used for identification purposes due to their inimitable pattern.
The distance between a person's extended middle fingers roughly corresponds to their height.

Test your knowledge about amazing bodily ratios and similarities in the human body, such as the ratio between arm span and height, and the length of the femur bone. Explore the fascinating similarities that all human bodies share.