Week 1 Science and Scholarships Flashcards
What constitutes the integumentary system?
skin and accessory organs
Outline function of the integumentary system
-protection from environmental hazards
-regulate temperature
What constitutes musculoskeletal system?
bones, muscles, joints
Outline function of muscular system
Locomotion
Support
Heat generation
Outline function of skeletal system
Support
protection of soft tissues
mineral formation
blood formation
What constitutes the nervous system
brain and spinal chord
Outline function of nervous system
Directing immediate responses to stimuli
Regulating other organs and body systems to carry out homeostasis
integrating stimuli and control centres
What constitutes the endocrine system
endocrine glands
Outline functions of endocrine system
Directing longe term changes (via molecules and hormones) to regulate activities of other body systems and organs
What constitutes the reproductive system
male and female sex organs + cells and tissues
Outline function of reproductive system
production of sex cells and hormones
support embryonic development from conception to childbirth
What constitutes the cardiovascular system
blood vessels and the heart
Outline the function of the cardiovascular system
transport of nutrients , gases and water
What constitutes the lymphatic system
lymphatic vessels and lymphatic organs
outline function of lymphatic system
governs immunity and defence
regulates fluid levels in the body
What constitutes the respiratory system
airways and lungs
what is the function of the respiratory system
delivery of air to sites for gas exchange to occur between the air and circulating blood
what constitutes the urinary system
the urinary bladder,urethra and ureter
what are atoms
smallest stable unit of matter
what makes up atoms
protons(+) neutrons(no charge) and electrons(-)
atoms have ___ charge
no charge
what are atoms that lose or gain an electron called
ions
cations are
atoms that lose an electron(s) to gain a net positive charge
+
anions are
Define an element
pure substance that consist only of atoms of the same type (i.e with the same atomic number)
List the principal elements of the human body + one function
Carbon-all organic compounds
Hydrogen-water + body components
Nitrogen-proteins, nucleic acids
Oxygen-water + respiration
Phosphorus-bones, teeth
Calcium-bones, nerve impulse, muscle contraction
What are molecules and compounds
substances consisting of atoms of one or more elements joined together by a chemical bond
Difference between compound and molecules
List the four classes of biomacromolecules
lipids
proteins
nucleic acids
carbohydrates
What are organic compounds made of
C,H and usually O
How many bonds can Carbon form
up to 4 bonds with atoms
Whats the importance of amino group
acts as a base by accepting H+ based on pH
can form bonds with other molecules
What is the importance of carbonyl group
acts as an acid releasing H+ to become COOH
What is the importance of hydroxyl group
may link molecules through dehydration synthesis
what is the importance of phosphate group
may link other molecules to form larger molecules
may store energy
What are carbohydrates made up of
CHO
1:2:1 ratio
What is the function of carbohydrate
energy source+storage
what are examples of carbohydrates
sugars and starches
what is a monosaccharides
simplest sugars containing one carbon ring
eg glucose, fructose
what is a disaccharide
contain two carbon rings
example of disaccharide
sucrose lactose
what are polysaccharides
complex sugars containing hundreds of carbon rings
what are examples of polysaccharides
glycogen and starch
what are lipids
organic molecules that can not readily dissolve in water
CHO
1:2<1
doesn’t attract water
examples of lipids
fats, oils and waxes
function of lipids
energy
examples of monosaccharides
glucose and fructose-energy source
galactose
examples of disaccharides
sucrose, lactose and maltose-energy source
examples of polysaccharides
glycogen-energy storage
cellulose
amylose
amylopectin
starch
list some lipids
fatty acids
glycerides
eicosanoids
steroids
phospholipids
function of fatty acids
energy sources
function of glycerides
energy sources, energy storage , insulation and physical protection
function of eicosanoids
chemical messengers coordinating local cellular activities
function of steroids
structural components of cell membranes, hormones
function of phospholipids
structural component of cells membranes
what elements do proteins contain
CHON (s)
What are functions of proteins
structural support
movement
transport
enzyme / catalyst
coordination and control
immune defence
what is the primary structure
sequence of amino acids
what is secondary structure
bonds formed between atoms at different parts of the polypeptide chain
what is a tertiary structure
coiling and folding to give protein a final 3d shape
what is a quaternary structure
interactions between multiple polypeptides chains
what are nucleic acids made up of
contains CHONP
phosphate group
pentose sugar
nitrogenous base (ACGTU)
Function of of nucleic acids
to store and transfer information
identify two types of nucleic acids
dna and rna
Function of DNA
growth development and reproduction
What does DNA contain
genetic instructions
what bonds form between nitrogenous bases in the double helix
Hydrogen bonds
identify three types of RNA
mRNA
tRNA
rRNA
function of mRNA
encode amino acid sequences during translation
function of tRNA
carry amino acids during translation
function of rRNA
constitute component of ribosomes
define chemical bond
an attraction that links atoms and ions together
what is an intramolecular bond
keep a molecule intact
forms stronger bonds
what is an intermolecular bonds
hold multiple molecules together
weak bonds
what are valence electrons
electrons in the outermost shell
what are covalent bonds
atoms share electrons to fill out their outer electron shell and enable stability of the atoms
how are covalent bonds classified
single, double and triple depending on the number of pairs of electrons shared
polar and non polar
what are polar covalent bonds
when electrons are unequally distributed in an atom this creates a partial polar region
what are non polar covalent bonds
electrons are equally shared between atoms and there is no net electrical charge difference across the molecule
what are ionic bonds
involves the transfer of valence electrons between two oppositely charged ions
what are metallic bonds
valence electrons are donated to a sea of freely moving electrons
properties of metals
-very strong
-malleable and ductile ‘
-good conductors of electricity and heat
identify the two types of van der Waals bonds
London dispersion forces
Dipole-dipole bonds