Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Ch. 1 Sec. 1 Body Organization & Homeostasis Levels of organization in the body • • The smallest unit of organization is the cell The largest unit of organization is the organ system cells tissues organs organ systems 1 Cell The basic unit of structure and function in a living thing 6 basic types in an animal cell Cell Types Bone Cell Cartilage Cell Muscle Cell Blood Cell Nerve Cell Small Intestine Cell Cell Membrane forms outside boundary of cell 2 Nucleus control center- directs cell’s activities The nuclei can be seen in the photograph of human cheek cells below. Cytoplasm clear, jellylike substance contains organelles 3 Mental Break Tissue A group of similar cells that perform the same function Four basic types: muscle, nervous, connective, and epithelial 4 basic types of tissues Muscle tissue Nerve tissue Connective tissue Epithelial tissue Makes parts of body move Contracts and shortens 4 What it looks like… 4 basic types of tissues Muscle tissue Nerve tissue Connective tissue Makes parts of body move Directs and controls the movement Contracts and shortens Carries electrical messages between brain and parts of body Epithelial tissue What it looks like… 5 4 basic types of tissues Muscle tissue Nerve tissue Connective tissue Epithelial tissue Makes parts of body move Directs and controls the movement Provides support for the body Contracts and shortens Carries electrical messages between brain and parts of body Connects all the parts What it looks like… 4 basic types of tissues Muscle tissue Nerve tissue Connective tissue Epithelial tissue Makes parts of body move Directs and controls the movement Provides support for the body Covers inside and outside body surfaces Contracts and shortens Carries electrical messages between brain and parts of body Connects all the parts Releases and absorbs chemicals 6 What it looks like… Mental Break An organ is a structure that is made of different kinds of tissue. Your stomach, heart, brain, and lungs are all organs. 7 Organs continued… An organ performs a specific job The job is more complex than that of a tissue Example – the heart Pumps blood throughout your body, over and over again It contains all four kinds of tissue Organ System A group of organs that work together to perform a major function Each organ in the body is part of a system Example Your heart is part of your circulatory system, which carries oxygen and other materials throughout the body. Besides the heart, blood vessels are organs in the circulatory system. 8 organ systems We will review 10 organ systems in the body Mental Break Homeostasis process by which an organism’s internal environment is kept stable in spite of changes in external environment 9 Example of homeostasis Internal body temperature is always around 98° no matter what the temperature outside Maintaining Homeostasis Regardless of the surrounding temperature, your body temperature remains fairly constant at about 98°. Sweating and shivering help regulate your body temperature. 10 stress reaction of your body and mind to potentially threatening, challenging or disturbing events disrupts homeostasis Mental Break 11 List the 4 levels of organization in the human body. Give an example of each level. cell- bone cell tissue- muscle tissue organ- heart organ system- circulatory system What are the 4 types of tissue found in the human body? What is the general function of each type? muscle tissue= movement nerve tissue= carries messages between the brain and other parts of the body connective tissue= provides support and connects all parts of the body epithelial tissue= covers surfaces of body; absorbs & releases substances 12 What is homeostasis ? process by which an organism’s internal environment is kept stable in spite of changes in external environment What is stress? How does it affect homeostasis? reaction of your body and mind to threatening, challenging or disturbing events upsets homeostasis Homework Write a paragraph that explains what body systems are involved when you sit down to do your homework. Be sure to begin your paragraph with a topic sentence and include supporting details. Use the graphic organizer to complete this assignment. 13