The study of the structure and shape of the body and its parts and their relationships to one another.
Gross anatomy-study of large, easily observable structures.
Microscopic anatomy-study of body structures only seen by a microscope.
Levels of Organization
1. Protons, neutrons, and electrons gather to form...
2. Atoms form...
3. Molecules form...
4. Organelles form...
5. Vitalism forms...
6. Cellular Level form...
7. Tissue Level form...
8. Organ level form...
9. Organ system Level form...
Every cell of the human body is surrounded by an external membrane that contains its contents and allows needed substances in while generally preventing entry of potentially damaging or unnecessary substances. (Integumentary system= skin)
Or irritability, is the ability to sense changes (stimuli) in the environment and then react to them.
Refers to all chemical reactions that occur within body cells (regulated chiefly by hormones secreted by the glands of the endocrine system).
The process of breaking down ingested food into simple molecules that can be absorbed into the blood.
The production of offspring, can occur on the cellular or organismal level (regulated by the hormones of the endocrine system).
Oxygen (20% of the air we breathe)
Water (60-80% of our body weight)
Appropriate temperature (37 C, or 98 F)
Appropriate atmospheric pressure.
The body's ability to maintain relatively stable internal conditions even though the outside world is continuously changing. (Indicates dynamic state of equilibrium, or a balance in which internal conditions change and vary but always withing narrow limits).
1. Stimulus produces change in variable
2. Receptor: sensor that monitors and responds to changes in the environment0 responds by sending information (input) to the control center on the AFFERENT pathway.
3. Control Center-determines the level (set point) at which a variable is to be maintained, analyzes the info it receives and then determines the appropriate response or course of action. The output is sent along the EFFERENT pathway to the effector. This provides the means for the control center's response to the stimulus.
Negative Feedback Mechanisms
Systems in which the net effect of the response to the stimulus is to shut off the original stimulus or reduce its intensity. (Example: Body Temperature; see page 13).
Positive Feedback Mechanisms
Rare; they tend to increase the original disturbance (stimuli) and push the variable farther from its original value. (Example: Blood clotting or birth; see page 13).
Body is erect with the feet parallel and the arms hanging at the sides with the palms facing forward.
Close to the origin of the body part or the point of attachment of a limb to the body trunk.
Farther from the origin of a body part or the point of attachment of a limb to the body trunk.
A cut along the lengthwise, or longitudinal, plane of the body, dividing the body into right and left parts. (If down the median plane of the body and right and left parts are equal in size, it is called a median, or midsagittal section.
A cut along a lengthwise plane that divides the body (or organ) into anterior and posterior parts. (AKA coronal section)
A cut along a horizontal plane, dividing the body or organ into superior and inferior parts. (AKA cross section).
Dorsal Body Cavity
Has two subdivisions, which are continuous with each other: Cranial Cavity- space inside the boy skull
Spinal Cavity- extends from the cranial cavity nearly to the end of the vertebral column. (Spinal cord, continuation of brain, is protected by the vertebrae, which surround the spinal cavity).
Ventral Body Cavity
Contains structures within chest and abdomen (visceral organs). It's subdivided into 3 parts:
Thoracic cavity- separated from the rest of the ventral cavity by the diaphragm. Organs= lungs and heart) protected by ribs.
Abdominal Cavity-contains stomach, liver, intestines, and other organs
pelvic Cavity- contains reproductive organs, bladder, and rectum. (There is no actual physical structure dividing the abdominopelvic cavity (abdominal + Pelvic cavities).
Central region in the thoracic cavity that separates the lungs into right and left cavities; it houses the heart, trachea, and other visceral organs.
9 Abdominopelvic Quadrants
Right Hypochondriac Epigastric Left hypochondriac
Right Lumbar Umbilical Left lumbar
Right Iliac Hypogastric Left Iliac
Oral Oral and Digestive Cavities
Oral cavity (mouth) contains teeth and tongue. Continuous with the cavity of the digestive organs, which opens to the exterior at the anus.
Located within and posterior to the nose, the nasal cavity is part of the respitory system passageways.