The Animal Body Basic Form And Function Flashcards
Common functions of all living things are?
responsiveness, growth, reproduction, movement, metabolism
responsiveness
an organism change in response to its environment
*longer-term change is called adaptation
growth
an increase in size, number of cells, complexity of cells, or all three
*the process of developing a variety of cells is called differentiation
reproduction
creation of new generations of similar organisms
movement
ability to transport things within the internal environment of the organism
ability to transport the organism through the external envirnoment
metabolism
the sum total of all the chemical reactions in the organism
uses resources absorbed from the environment
uses respiration for cellular production of energy
organism excretes any waste products left over from the chemical reactions
what is anatomy
it is the structure of things or how things are built, form
- specifics of:
- where things are
- what they are made of
- physical relationships between parts
the word anatomy means…
“a cutting open”
anatemno “I cut apart”
what is physiology
the function of the anatomical structures
*specifics of:
how structures, organs, and systems work separately and together
what is the level of organizations
chemical levels, cellular level, tissue level, organ level, organ system level, organism level
chemical level
atoms are the smallest stable units of matter
atoms combine to form molecules
molecular shape defines function
cellular level
combination of molecules, atoms, and organelles to perform a specific function in a cell
tissue level
a collection of cells working together to perform a specific function
organ level
two or more tissues working together to perform specific functions
organ system level
two or more organs working together to perform specific functions
organism level
multiple organ systems working together to maintain health
what are the vertebrate organ systems
integumentary, skeletal, muscular, nervous, endocrine, cardiovascular, lymphatic, respiratory, digestive, urinary, reproductive
what does the integumentary system do
it protects against environmental hazards; helps control body temperature
what does the skeletal system do
it provides support; protects tissues; stores minerals; forms blood cells
what does the muscular system do
it allows for locomotion; provides support; produces heat
what does the nervous system do
it directs immediate responses to stimuli, usually by coordinating the activities of other organ systems
what does the endocrine system do
it directs long-term changes in activities of other organ systems
what does the cardiovascular system do
it transports cells and dissolved materials, including nutrients, wastes, and gases
what does the lymphatic system do
it defends against infection and disease; returns to tissue fluid to the bloodstream
what does the respiratory system do
it delivers air to sites where gas exchange can occur between the air and circulating blood; produces sound
what does the digestive system do
it processes food and absorbs nutrients
what does the urinary system do
it eliminates excess water, salts, and waste products
what does the female reproductive system do
it produces sex cells and hormones; supports embryonic and fetal development from fertilization to birth
what does the male reproductive system do
it produces sex cells and hormones
what is homeostasis
it is the maintenance of a relatively stable internal environment
* “relatively stable” means there are variations
* dynamic equilibrium
it is the result of interdependence of organ systems functioning together
what is homeostasis regulation
it is the adjustments in physiological systems that preserve homeostasis
a typical homeostasis feedback loop contains…
a receptor that receives a stimulus
a control center that processes and integrates information from the receptor
an effector that responds to the control center to change the body’s response
what is negative feedback
corrects deviations from normal
*most common form of feedback loop
variations from the norm that are increases are brought back down
variations from the norm that are decreases are brought back up
example of negative feedback loop: thermoregulation
If your body temperature drops too low?
The brain sends signals to skeletal muscles to start shivering and to blood vessels in the skin to constrict
Temperature rises
example of negative feedback loop: thermoregulation
If your body temperature drops too high?
The brain sends a message to the skin to dilate blood vessels and sweat
Temperature lowers
what is positive feedback
reinforces or exaggerates deviations from normal
variations from the norm that are increases are further increased
variations from the norm that are decreases are further decreased
positive feedback mechanisms are relatively rare and must be controlled by an independent “off switch”
example of positive feedback loop: uterine contractions
release of hormone oxytocin
triggered by pressure against inside of cervix
causes contractions of muscles of the uterine wall
contractions push child against inside of cervix, continuing the feedback cycle
what is primary medical terminology
it describes body regions, anatomical positions, and directions, and body sections
- surface anatomy
- sectional anatomy
what is anatomical position
hands at the sides with the palms facing forward and feet together
- supine (face up)
- prone (face down)
what is anatomical regions
two methods to map the surface of abdomen and pelvis
- abdominopelvic quadrants
- abdominopelvic regions
what are the abdominopelvic quadrants
right upper quadrant I left upper quadrant
right lower quadrant I left lower quadrant
what are the abdominopelvic regions
right hypochondriac region right lumbar region right inguinal region epigastric region umbilical region hypogastric(pubic) region left hypochondriac region left lumbar region left inguinal region
what is anatomical directions
provides an orientation of structure relative to anatomical position
left an right always refer to the left and right rides of the subject, not the observer
cranial(towards the head)
caudal(towards the tail)
dorsal(towards the back/spine side)
ventral(towards the front side stomach)
superior(above)
inferior(under)
anterior(behind)
posterior(in front)
medial(middle/towards the middle)
lateral(side/away from the midline)
proximal(closer)
distal(distance/away)
superficial(shallow/close to the skin)
deep(closer to the middle/inside)
central(brain and spinal cord/middle)
peripheral(nerves/edges)
ipsilateral(same side)
contralateral(opposite side)
what is sectional anatomy
a “slice” through the body in three primary sectional planes
types of sectional anatomy
transverse, frantal, and sagittal plane
transverse plane (“cross section”)
divides body into “head” and “tail” portions
frontal plane (or coronal plane)
divides body into “belly” and “back” portions
sagittal plane
divides body into left and right portions
what do body cavities do
protect internal organs
allow organs to change shape
*dorsal and ventral cavities exist
what do dorsal cavity(found in the verterbrates) typically contains
neural tissue
what does ventral cavity contains
viscera(internal organs)
viscera are organs of…
the respitory, cardiovascular, digestive, urinary, and reproductive systems
cavities are lined by…
parietal layer
organs are enclosed(visceral layer) by…
serous membranes
what are the two parts that divide the ventral cavity?
*body cavities are often subdivided into smaller cavities
- thoracic cavity
- abdominopelvic cavity
what are the three internal chambers in the thoracic cavity
one pericardial(middle) cavity and two pleural(side) -each cavity is defined by a serous membrane
pericardial cavity
Contains the heart
Defined by a serous membrane called the pericardium
Visceral pericardium is the layer covering the heart
Parietal pericardium(lines the heart) is the outer layer
Between the two layers is serous fluid to reduce friction
pleural cavity
Each lung is found within its own pleural cavity
Serous membrane is the pleura
Visceral pleura is the layer covering the lung
Parietal pleura lines the inner surface of the chest wall
abdominopelvic cavity
Subdivided into superior abdominal cavity and inferior pelvic cavity
Contains the peritoneal cavity, lined with a serous membrane called the peritoneum
Visceral peritoneum covers internal organs
Parietal peritoneum lines inner surface of body wall