30.1 Organization of the Human Body

- Organization of the human body- Homeostasis- Feedback Inhibition

Organization of the Human body

• Cells (smallest)• Tissues• Organs• Organ system

(largest)

Cells

• The basic unit of structure of the human body.

• Tend to be specialized in multi-cellular organisms.

Tissues

•A Tissue is a group of cells that are working together.

Organs

• Organs: a group of tissues that work together to perform a single function or a group of functions.

Organ Systems

•Organ Systems: A group of organs that perform closely related functions.

Tissues

•Epithelial•Connective•Nervous•Muscle

Epithelial Tissue• Lines the inside and

outside surfaces of different organs.

• Function(fxn): Protection, absorption, and excretion

• Example: Skin, stomach lining.

Connective Tissue

• Provides support for the body and its parts• Bind epithelial tissue to structures,

support, and transport. • Examples: collagen,

Nervous Tissue• Receives and transmits nerve impulses

(signals) • Example: Brain, spinal column, and

nerves.

Muscle Tissue

• Voluntary and Involuntary movements

• Skeletal, cardiac, and smooth muscles.

Name the organ without all types of tissue.

Organ Systems that work Together

HomeostasisHomeostasis• Homeostasis:• The relatively

constant internal physical and chemical conditions that organisms maintain despite changes in their environment

Examples of Homeostasis

•Blood pressure

•Body Temperature

•Blood pH

Feedback Inhibition

• The way the body maintains homeostasis.

• The body produces a response to oppose the original stimulus

• Heater Example: the heater shuts off after the temp reaches a certain level.