Lecture 1

What are the four components of a human organism?

cells, tissues, organs, systems.

What is a cell?

A cell is the basic structural and functional unit of all living organisms.

What is tissue?

Tissue is a group of cells that work together to perform a specific function in the body.

What is an organ?

An organ is a group of tissues that work together to perform a specific function in the body.

What is a system?

A system is a group of organs that work together to perform complex functions in the body.

What is homeostasis?

Homeostasis is the process by which biological systems maintain a stable internal environment despite external changes.

What is a negative feedback loop

A negative feedback loop is a biological mechanism where a change in a physiological variable triggers a response that counteracts that change, helping to maintain homeostasis.

What is a positive feedback loop?

A positive feedback loop is a biological mechanism where a change in a physiological variable triggers a response that enhances that change, leading to an amplification of the initial effect.

What is an example of a negative feedback loop?

An example of a negative feedback loop is the regulation of body temperature in humans, where an increase in body temperature triggers mechanisms to cool the body, such as sweating.

What are the four components of a human organism?

cells, tissues, organs, systems.