Question

Define organ. When a group of organs works together, what name is it given? (p. 6)

Short answer

Question: Define the term "organ" and identify the name given when a group of organs works together. Answer: An organ is a group of tissues working together to carry out specific functions in an organism. When a group of organs works together to perform a particular function, this group is called an "organ system."

Step-by-step solution

Definition of Organ

An organ is a group of tissues that work together to carry out specific functions in an organism. Organs are made up of cells and tissues that are specialized for these functions, and they often have distinct structures that enable them to carry out their roles effectively.

Organ Systems

When a group of organs works together to perform a particular function or a set of closely related functions, this group is called an "organ system." Organ systems are a higher level of organization within multicellular organisms, and they allow for efficient collaboration and communication between different organs to maintain overall homeostasis and optimal functioning within the organism.

Key concepts

Definition of Organ

Imagine your body as a highly sophisticated factory, each part playing a specific role to keep the entire system running smoothly. An organ is somewhat like a department in that factory. It's a collection of tissues united to perform a unique and vital function that contributes to the overall well-being of the entire organism. These tissues are not random, however; they are highly specialized and structured in a way that allows the organ to execute its designated task effectively.

Take the heart, for example. This powerful muscle pumps blood throughout the body, delivering oxygen and nutrients to other tissues and removing waste products. It’s composed of cardiac muscle tissue that contracts rhythmically, as well as connective tissues that give it structure and blood vessels that nourish it. This collaboration between different tissue types exemplifies the unity and specialization within an organ.

Multicellular Organism

Living organisms are incredibly diverse, ranging from the smallest bacterium to the largest whale. A multicellular organism is made up of more than one cell, differentiating it from unicellular organisms that consist of a single cell. These cells don't work in isolation; rather, they work in concert to form tissues, organs, and, ultimately, the entire organism.

In multicellular organisms, cells become specialized for different functions, an attribute known as cell differentiation. This specialisation within cells is fundamental to an organism’s ability to perform complex tasks which a single cell cannot do on its own. Whether it's the neuron in the brain, sending electrical signals, or the red blood cells transporting oxygen, each has a specific role that supports the larger system. As these cells work together, they form tissues, which then group to form organs, further illustrating the intricate hierarchy of biological organization.

Homeostasis

The term 'homeostasis' might seem complex, but it describes a concept that is essential to life. Homeostasis refers to the dynamic process through which an organism maintains a stable internal environment, despite changes in the external environment. This internal balance is crucial for survival and proper functioning.

The body has numerous systems and mechanisms in place to monitor and adjust physiological variables such as temperature, pH, hydration, and levels of nutrients and waste. For example, when you exercise, your muscles produce heat, causing your body temperature to rise. In response, your body activates cooling mechanisms like sweating and increasing blood flow to the skin's surface to dissipate heat, ensuring your body temperature doesn't become dangerously high. This self-regulating capacity is an incredible feat of biological engineering and is the cornerstone of healthy function in every multicellular organism.