5. The Body as a Whole Flashcards
What is the Fundamental Unit of Life?
Cell
- Every human begins life as a single cell, a fertilized egg.
- The fertilized egg resulted from penetration of an egg by a sperm, each contributing 23 unpaired chromosomes, thus resulting in a total of 46 chromosomes (23 pairs) in humans.
-Rapid chemical changes in the membrane of the fertilized egg prevent the penetration of additional sperm.
-This single cell divides into 2 cells, then 4, 8, and so on, until maturity.
-Humans in the early stages of development until the end of the eighth week are referred to as embryos.
-During development, cells become specialized.
-Cells that have the ability to divide without limit and give rise to specialized cells are called stem cells. They are abundant in a fetus and in the cord blood of a newborn. Stem cells are used in bone marrow transplants and can be used in research for organ or tissue regeneration.
What are the different types of somatic, or body, cells?
Nerve cells, muscle cells, and blood cells.
- In humans, each somatic cell has 23 pairs of chromosome.
- Somat+ic cells account for all the body’s cells except the reproductive cells—the sperm and eggs (ova).
-Somatic cells are surrounded by a cell membrane and have a nucleus that contains genetic information, cytoplasm (the liquid portion outside the nucleus), and organelles (cytoplasmic inclusions)
somat/o = body
Groups of cells that perform the same basic activity are called?
tissues
What are the Four Main Types of Tissue?
Epithelial tissue, Connective tissue, Muscular tissue, and Nervous tissue
What are Epithelial tissue?
They form the covering of both internal and external surfaces (skin and lining of cavities). Cells are joined by small amounts of cementing substances.
What are Connective tissue?
Connective tissue supports and binds other body tissue and parts (bone and fat cells, for example)
What are Muscular tissue?
Muscular tissue is composed of fibers that are able to contract, causing movement of body parts and organs.
What are Nervous tissue?
Nervous tissue conducts impulses that connect the brain and spinal cord with other parts of the body.
______ 1. connective
A. conducting impulses
B. contracting
C. covering
D. supporting and protecting
supporting and protecting
______ 2. epithelial
A. conducting impulses
B. contracting
C. covering
D. supporting and protecting
C. covering
______ 4. nervous
A. conducting impulses
B. contracting
C. covering
D. supporting and protecting
A. conducting impulses
______ 3. muscular
A. conducting impulses
B. contracting
C. covering
D. supporting and protecting
B. contracting
Two or more tissue types that work together to perform one or more functions and form a more complex structure make up …
Organs
-The skin, stomach, and ear are examples of organs.
- A body system consists of several organs that work together to accomplish a set of functions.
What are the MAJOR BODY SYSTEMS?
Mnemonic= MR DICE RUNS
Muscular system
Respiratory system
Digestive system
Integumentary system
Cardiovascular system
Endocrine system
Respiratory system
Urinary system
Nervous system
Skeletal system
Major function of the Muscular system?
Makes movement possible
Major function of the Skeletal system?
Provides protection, form, and shape for the body; stores minerals and forms some blood cells
Major function of the Cardiovascular system?
Delivers oxygen, nutrients, and vital substances throughout the body; transports cellular waste products to the lungs and kidneys for excretion
Major function of the Lymphatic system?
Helps maintain the internal fluid environment; produces some types of blood cells; regulates immunity
Major function of the Respiratory system?
Brings oxygen into the body and removes carbon dioxide and some water waste
Major function of the Digestive system?
Provides the body with water, nutrients, and minerals; removes solid wastes
Major function of the Urinary system?
Filters blood to remove wastes of cellular metabolism; maintains the electrolyte and fluid balance
Major function of the Reproductive system?
Facilitates procreation (producing offspring)
Major function of the Integumentary system?
Provides external covering for protection; regulates body temperature and water content
Major function of the Nervous system?
Coordinates the reception of stimuli; transmits messages to stimulate movement
Major function of the Endocrine system?
Secretes hormones and helps regulate body activities
Major function of the Endocrine system?
Secretes hormones and helps regulate body activities
The most complex level in the organizational scheme is the …?
organism, the human body.
Homeo+stasis refers to…?
the constant internal environment that is naturally maintained by the body.
home/o = sameness
-stasis = controlling
Think of homeostasis as equilibrium.
ana-:
upward, excessive or again
-plasia:
development or formation of tissue
a+plasia:
The lack of development of an organ or tissue
dys+plasia:
Any abnormal development of tissues, recognized by cells that differ in size, shape, and appearance
hypo+plasia:
Underdevelopment of an organ or a tissue; less severe than aplasia
hyper+plasia:
An abnormal increase in the number of normal cells in tissue
hyper+trophy:
An increase in the size of an organ caused by an increase in the size of existing cells rather than the number of cells (as in hyperplasia). Fig. 5.6 shows a comparison of the two terms.
a- =
-plasia =
dys- =
hypo- =
hyper- =
a- = without
-plasia = formation or development
dys- = bad
hypo- = below normal
hyper- = above normal
Ana+plasia:
(in this case, meaning upward, or an earlier stage of development) refers to a change in the structure and orientation of cells, characterized by a loss of differentiation and reversal to a more primitive form. The microscopic appearance of cells from a malignant tumor shows new features that are not characteristic of their tissue of origin.
______ increase in size of an organ due to an increase in the number of normal cells
A. aplasia
B. hyperplasia
C. hypertrophy
D. hypoplasia
B. hyperplasia
______ increase in the size of an organ caused by an increase in the size of the cells
A. aplasia
B. hyperplasia
C. hypertrophy
D. hypoplasia
C. hypertrophy
______ lack of development
A. aplasia
B. hyperplasia
C. hypertrophy
D. hypoplasia
A. aplasia
______ underdevelopment
A. aplasia
B. hyperplasia
C. hypertrophy
D. hypoplasia
D. hypoplasia
trans- =
trans- = across
What plane divides the body into front and back portions?
frontal (coronal) plane
What plane divides divides the body into upper and lower portions?
transverse plane
What divides the body into right and left sides?
sagittal plane
What plane divides the body into two equal halves?
A midsagittal plane
anter/o = front
anterior (front)
nearer to or toward the front; ventral
poster/o = behind
posterior (behind)
nearer to or toward the back; dorsal; situated behind
later/o = side
lateral (side)
toward the side; denoting a position farther from the midline of the body or from a structure
medi/o = middle
medial (middle)
middle or nearer the middle; the prefix mid- also means middle
super/o = uppermost
superior (uppermost)
uppermost or above
infer/o = lowermost
inferior (lowermost)
lowermost or below
ventr/o
ventral
belly side; same as anterior surface in humans
dors/o
dorsal
directed toward or situated on the back side; same as posterior surface in humans
proxim/o
proximal
nearer the origin or point of attachment
dist/o
distal
far or distant from the origin or point of attachment
cephal/o
cephalad
toward the head
caud/o
caudad
toward the tail or in an inferior direction in humans
intern/o
internal
inside, within (L., internus)
extern/o
external
outside (L., externus)
anteromedian: located in front and toward the middle
CF: anter/o, front
CF: medi/o, middle
posteroexternal: situated on the outer side of a posterior aspect
CF: poster/o, back
CF: extern/o, outside
posteromedian: situated in the middle of the back
CF: poster/o, back
CF: medi/o, middle
dorsolateral: pertaining to the back and the side
CF: dors/o, back
CF: later/o, side
posterolateral: pertaining to a position behind and to the side
CF: poster/o, back
CF: later/o, side
anterolateral: pertaining to the front and one side
CF: anter/o, front
CF: later/o, side
mediolateral: pertaining to the middle and one side
CF: medi/o, middle
CF: later/o, side
anterosuperior: indicates a position in front and above
CF: anter/o, front
CF: super/o, above
posterosuperior: indicates a position behind and above
CF: poster/o, behind
CF: super/o, above
inferomedian: situated in the middle of the underside
CF: infer/o, under
CF: medi/o, middle