Repolarization of a cell membrane (muscle cell or neuron) is accomplished by the
ID: 98651 • Letter: R
Question
Repolarization of a cell membrane (muscle cell or neuron) is accomplished by the opening of which type of channel?
sodium
potassium
glucose
calcium
Fertilization usually occurs in the
vagina
ovaries
testicles
fallopian tubes/oviducts/uterine tubes
uterus
Which of the following receives incoming sensory input and then relays it to the correct location in the cerebrum?
thalamus
hypothalamus
hippocampus
midbrain
The component of the autonomic nervous system that is responsible for the flight or fight response is the
central nervous system (CNS)
somatic nervous system
parasympathetic nervous system
sympathetic nervous system
An infectious disease that has spread world-wide would be a(n)
outbreak
pandemic
epidemic
Sperm have an enzyme containing structure called a(n) ________ which assists with penetration of the egg.
follicle
epididymus
acrosome
zona pellucidum
An inhibitory neurotransmitter binds to ligand gated _______ channels.
sodium
calciu
potassium
iron
The basic functional unit of a skeletal muscle contraction is called the
T-tubule
fascicl
osteon
sarcomere
The substance tissue plasminogen activator (t-PA) can be administered to an individual in order to
stop an asthma attack
dissolve a blood clot
treat cancer
lower blood cholesterol levels
An individual who is in the chronic phase (category B) of HIV infection would
have some symptoms of a suppressed immune system (fever, fatigue)
would be hospitalized for opportunistic infections (pneumonia
have some symptoms, but would not be able to transmit the disease
have no symptoms
Explanation / Answer
The repolarization phase usually returns the membrane potential back to the resting membrane potential. The efflux of K+ ions results in the falling phase of an action potential. The ions pass through the selectivity filter of the K+ channel pore.
Fertilization occurs in the fallopian tubes/oviducts/uterine tubes
The hypothalamus is a part of the brain that has a vital role in controlling many bodily functions including the release of hormones from the pituitary gland.
The sympathetic nervous system originates in the spinal cord and its main function is to activate the physiological changes that occur during the fight-or-flight response. Thiscomponent of the autonomic nervous system utilizes and activates the release of norepinephrine in the reaction.
A pandemic is a global disease outbreak. HIV/AIDS is an example of one of the most destructive global pandemics in history.
Acrosome contains the enzymes that break down the outer membrane of the ovum, called the zona pellucida, allowing the haploid nucleus in the sperm cell to join with the haploid nucleus in the ovum.
inhibitory neurotransmitters cause an opening of ligand-gated potassium ion channels which leads to a local hyperpolarization (more negative than normal). This is known as a Inhibitory Postsynaptic Potential (IPSP) because it’s going to be LESS likely to throw off an action potential.When an inhibitory NT activates the receptor site, it causes additional potassium channels to open which may cause potassium ions to flow out of the cell and if additional positively charged potassium ions flow out of the cell, the inside of the cell will become more negative.
A sarcomere is the basic unit of muscle contraction of striated muscle tissue.
Tissue plasminogen activator is the activators of plasminogen and results in the breakdown of blood clots (fibrinolysis)
An individual who is in the chronic phase (category B) of HIV infection would have some symptoms of a suppressed immune system (fever, fatigue) .