Chapter 3 - Levels Of Organization Flashcards
(77 cards)
Cells
The structural units that form all body tissues.
Tissue
Composed of a group of similar cells that perform a specific function.
Epithelial tissue
Formed the epidermis (top layer of the skin) and surface layer of the membranes. Has many functions, including protection, absorption, and secretion.
Connective tissue
Composed of cells that are able to form tissues of various consistencies. These tissues act to connect and support other body tissues. Types of connective tissue include cartilage, adipose, bone, and even blood.
Nervous tissue
Composed of cells called neurons, which function to transmit nerve impulses by the release of chemicals called neurotransmitters. Nervous tissue comprises the brain, spinal cord, and nerves for the entire body.
Muscle tissue
Composed of cells called contractile fibers. As each muscle cell contracts or relaxes, it shortens or lengthens. consequently, the muscle also shortens or lengthens. muscles help you move your body, make your heart beat, help many of your internal organs function, and maintain your blood pressure.
Organs
Structures made up of two or more types of tissue that perform specialized functions.
Anatomical position
The patient in standing upright, with the arms at the side and palms facing forward. The patients legs are straight, and the toes are pointed forward. The midline is an imaginary line that runs from the head to the feet and through the umbilicus and divides the body into right and left halves.
Axial
Includes the head, neck, and trunk.
Appendicular
Includes the arms, or upper extremities and the legs, or lower extremities.
Body planes
Imaginary slices or cut through the body of the divide it vertically or horizontally.
Sagittal plane
Runs vertically from front to back and divides the body into right and left halves.
Frontal plane
Also known as coronal plane runs vertically from left to right and divides the body into front and back portions.
Transverse plane
Also known as the horizontal plane it’s horizontal line divides the body into upper and lower portions.
Dorsal cavity
Located on the posterior or back part of the body.
Cranial cavity
Contains the brain
Vertebral cavity
Contains the spinal column
Ventral cavity
Located on the anterior or front side of the body, consist of the thoracic and abdominopelvic cavities.
Thoracic cavity
Contains the lungs, heart, great vessels, trachea, and Thymus.
Abdominopelvic cavity
One large cavity, but an imaginary line is sometimes drawn to create a boundary between the abdominal and pelvic cavities.
Abdominal cavity
Contains the stomach, pancreas, liver, gallbladder, and large and small intestines.
Retroperitoneal space
An area where the kidneys lie at the back of the abdomen.
Pelvic cavity
Contains the sigmoid colon, rectum, bladder, and in females the uterus, fallopian tube’s, and ovaries.
Abduction
Movement toward the side, away from the body