Quiz #1 Ch. 1-4 Body Basics and Foundations Flashcards
What are membranes
Flat sheets of pliable tissue that cover or line a part of the body
What constitutes as an epithelial membrane
The combination of an epithelial layer and an underlying connective tissue layer
Mucous membranes
a body cavity that opens
directly to the exterior. Mucous membranes line the entire
digestive, respiratory, and reproductive systems. They are
found in the oral and nasal cavities and parts of the urinary
system.
o They consist of epithelium and connective tissue with specialized cells that
secrete mucus (goblet cells
Serous membranes
line a body cavity that does not open
directly to the exterior, and it also covers the organs that lie
within the cavity.
o They line the thorax and abdomen and cover the organs within
these cavities.
o Made up of epithelium and loose connective tissue that secrete
serous fluid that acts as a lubricant.
Synovial membranes
line the cavities of some joints.
o These membranes consist of only connective tissues, and they
secreted lubricating synovial fluid
Cutaneous membrane
consists of the skin (also called the
integument); epidermis + dermis + hypodermis of skin
what are epithelial membranes considered?
Epithelial membranes are considered to be organs because they are composed of more
than one type of tissue
Muscular tissue
- consists of elongated cells called muscle fibers that are highly specialized to generate force (contract).
- muscular tissue produces motion, maintains posture,
and generates heat
what are the three types of muscle tissue
- Skeletal muscle tissue is named for its location – it is usually attached
to the bones of the skeleton. (voluntary contraction) - Cardiac muscle tissue forms the bulk of the wall of the heart.
(involuntary contraction) - Smooth muscle tissue is located in the walls of hollow internal
structures such as blood vessels, airways to the lungs, the stomach,
intestines, gallbladder, and urinary bladder. (involuntary contraction)
two principal types
of cells for the nervous system
neurons and neuroglia
whare are nervous tissues found
brain, spinal cord, and nerves.
what do neurons do
They convert stimuli into nerve impulses (action potentials) and conduct these impulses to other neurons, to muscle fibers, or to glands.
Neuroglia
do not generate or conduct nerve impulses,
but they do have many other important protective and
supportive functions. They support and nourish neurons.
Tissue repair
is the process that replaces worn-out,
damaged, or dead cells.
New cells
originate by cell division from the stroma, the supporting connective tissue, or from the parenchyma.
fibrosis
if fibroblasts need to come in to repair the tissue, they synthesize materials that aggregate to form scar tissue
at what ages do tissues heal faster
in the young- surgery in fetus will not leave a scar
definition of tissue
group of cells with similar structure & function
Epithelial tissue
covers body surfaces; lines body cavities, hollow organs, and ducts; and forms glands.
what are the 4 types of tissue
epithelial, connective, muscular, nervous
connective tissue
protects and supports the body and its organs,
binds organs together, stores energy reserves as fat, and provides immunity
muscular tissue
generates the physical force needed to make body structures move.
nervous tissue
detect changes in inside and outside environments- trying to reach or maintain homeostasis
example of epithelial tissue
outer covering of the skin, outer covering of some organs
example of muscular tissue
Skeletal muscle, cardiac muscle, and smooth muscle
example of nervous tissue
brain, spinal cord, nerves
example of connective tissue
tendons and ligaments, cartilage
difference between intracellular and extracellular
intracellular fluid is found within body cells while extracellular is found outside
what is extracellular fluid
Fluid outside body cells
example of intracellular fluid
proteins, nucleus, mitochondria (things within a cell)
example of extracellular fluid
intestinal fluid, lymph, spinal fluid, breast milk
what is meiosis
meiosis is the process
that produces gametes – sperm and oocytes. Each gamete contains half of the parent cell’s genetic information (23 chromosomes each).
what is mitosis
During mitosis the duplicated chromosomes become exactly segregated, one set into each of two separate
nuclei.
what are the 4 stages of mitosis
o Prophase
o Metaphase
o Anaphase
o Telophase
purpose of mitosis
Mitosis is essential for growth
and for repair and replacement
of damaged cells.
prophase
During early prophase, the chromatin fibers condense and shorten into chromosomes that are visible under the light microscope
metaphase
During metaphase, the centromeres of the chromatid pairs are aligned along the microtubules of the mitotic spindle at the exact center of the mitotic spindle. This plane of alignment of the centromeres is called the metaphase plate.
anaphase
During anaphase the centromeres split, separating the two members of each chromatid pair, which move to opposite poles of the cell. Once separated, the chromatids are called chromosomes. As the chromosomes are pulled by the microtubules of the mitotic spindle during anaphase, they appear V‐shaped because the centromeres lead the way and seem to drag the trailing arms of the chromosomes toward the pole.
telophase
The final stage of mitosis, telophase, begins after chromosomal movement stops. The identical sets of chromosomes, now at opposite poles of the cell, uncoil and revert to the threadlike chromatin form. A new nuclear envelope forms around each chromatin mass, nucleoli appear, and eventually the mitotic spindle breaks up.
how many chromosomes are produces in mitosis
cell divides into two identical
cells (46 chromosomes each)
how many chromosomes are produced in meiosis
23 chromes
purpose of meiosis
to form the next generation of sexually reproducing organisms.
what is the difference between mitosis and meiosis
- Mitosis is the process by which most cells in the body divide, while meiosis is the process by which gametes are produced.
- Mitosis involves a single round of cell division, while meiosis involves two rounds of cell division.
- Mitosis produces two identical, diploid daughter cells, while meiosis produces four non-identical, haploid gametes.
- Mitosis occurs in somatic cells and is essential for growth and repair, while meiosis occurs in germ cells and is essential for sexual reproduction.
passive transport/process
substance moves down its
concentration gradient through the membrane, using
only its own energy of motion (kinetic energy), include
simple diffusion and osmosis. “no energy required” ex diffusion
active transport/process
– cellular energy, usually in the form of
ATP, is used to “push” the substance through the
membrane “uphill” against its concentration gradient. An
example is active transport. “requires energy”
what are organelles
Specialized cellular structures with characteristic shapes and specific
functions
what are the key organelles in an animal cell
nucleus, mitochondria, lysosomes, ribosomes, Golgi apparatus, Endoplasmic Reticulum (ER), peroxisomes, cytoskeleton, cell membrane, centrosomes
nucleus
Nucleus: The control center of the cell, it stores the cell’s genetic material (DNA) and coordinates activities like growth, metabolism, and reproduction.
mitochondria
Mitochondria: Known as the powerhouse of the cell, mitochondria generate energy (ATP) through cellular respiration, fueling the cell’s functions.
ribosomes
Ribosomes: These are the protein factories of the cell. They synthesize proteins by translating messenger RNA (mRNA).
Endoplasmic Reticulum (ER):
Endoplasmic Reticulum (ER):
Rough ER: Studded with ribosomes, it helps in the synthesis and modification of proteins.
Smooth ER: Lacks ribosomes and is involved in lipid synthesis and detoxification processes.
Golgi apparatus
Golgi Apparatus: The Golgi modifies, sorts, and packages proteins and lipids for secretion or use within the cell.