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In biology, a key idea is that structure determines function. In other words, the way something is arranged enables it to play its role, fulfill its job, within an organism (a living thing). Structure-function relationships arise through the process of natural selection.

How do different body systems work together to complete specific functions?

Just as the organs in an organ system work together to accomplish their task, so the different organ systems also cooperate to keep the body running. For example, the respiratory system and the circulatory system work closely together to deliver oxygen to cells and to get rid of the carbon dioxide the cells produce.

How does each level of organization in your body help make life possible?

Higher levels of organization are built from lower levels. Therefore, molecules combine to form cells, cells combine to form tissues, tissues combine to form organs, organs combine to form organ systems, and organ systems combine to form organisms.

What are the body systems and their functions?

Organ Systems of the Human Body

Organ System Functions
Muscular Locomotion Heat production
Nervous Coordinates activities of other organ systems Responds to sensations
Endocrine Regulates body functions by chemicals (hormones)
Cardiovascular Transports oxygen and nutrients to tissues Removes waste products

Which part of our body are made up only of muscles?

skeletal muscles

Is body hair vestigial in human?

Humans have a much longer anagen and shorter telogen than mammals. So, even though hairs have no longer survival value in Homo sapiens, when seen through Darwinian eyes, yet they do serve useful functions and are not completely vestigial!

What is the function of hair on the human body?

Hairs. Hairs (or pili; pilus in the singular) are characteristic of mammals. The functions of hair include protection, regulation of body temperature, and facilitation of evaporation of perspiration; hairs also act as sense organs.

Is the gallbladder a vestigial organ?

The gallbladder is considered a vestigial organ. It stores bile, a substance that’s secreted when you eat to facilitate digestion.

What is gallbladder function?

The gallbladder stores bile produced by the liver. After meals, the gallbladder is empty and flat, like a deflated balloon. Before a meal, the gallbladder may be full of bile and about the size of a small pear.

Why is the muscle that makes hair stand up vestigial?

Have you ever wondered why the hair on your neck or arms stands up when you’re scared or cold? It’s because of smooth muscles in your skin called “arrector pili.” These smooth muscles pull your hair follicles to stand up when you feel afraid or cold. In humans, this is pretty much pointless.

Why is wisdom teeth vestigial?

Wisdom teeth are considered a vestigial organ — no longer useful — because our diet has evolved. Early humans ate a mostly raw diet of foraged plants and hunted animals, which required a lot of rough chewing. That wore down their teeth.