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Flashcards in Homeostatsis Deck (15):

Homeostasis is defined as:

the process by which a constant internal environment is maintained despite changes in the external environment


Examples of negative feedback systems include:

Body temperature, blood pressure, hunger, blood sugar, production of red blood cells


Humans regulate their body temperature through a control center located in:



Which of the following list of organs are responsible for the removal of metabolic waste?

lungs, liver, skin, kidneys


The cerebral cortex is mainly concerned with which of the following?

information, memory, motor skills


Which of the following statements concerning a reflex is false? It…

allow rapid response, inner nerves don’t send signal to the brain
Stimulus>sensory neuron>interneuron>motor neuron>effector


Within the nervous system there are special structures that help to protect the system from injury. Name the membranes that surround the central nervous system?



The hormone _______ is released by ________ to ________ blood glucose:

Insulin – pancreas (beta cells) – lower
Cortisol – adrenal cortex – increase
Glucagon – pancreas (alpha cells) – increases


Which of the following is true regarding hormones and nerve impulses?

Nerve impulses = electrical impulses - fast
Hormones = chemical messengers – “slower”


The _______ nervous system is responsible for which of the following?

CNS = brain, spinal cord
PNS = sensory pathways, motor pathways, link nerves to the brain and spinal cord
Somatic NS = voluntary actions, skeletal muscles
Autonomic NS = involuntary actions, smooth + cardiac muscle
Sympathetic = activated in stressful situations
Parasympathetic = activated when body is calm/ at rest


_______ term stress often results in higher blood sugar levels. This may result in all but one of the following complications:

Short term stress – heart rate + blood pressure increase, blood flow to muscles and heart increases, breathing rate increases, blood glucose rises, rate of cellular metabolism increases
Long term stress – kidney absorbs Na+ ions and water, blood pressure + volume increases, protein and fat metabolism stimulated – releases glucose, inflammation reduced – immune cells suppressed


Exocytosis is used by the synaptic vesicles to release their contents at which of the following?

presynaptic membrane


Given the steps shown below, which is the correct sequence for transmission at a chemical synapse?

Action potential depolarizes the synaptic terminal membrane, Ca2+ ions rush into neurons cytoplasm, synaptic vesicles release neurotransmitter into the synaptic cleft, neurotransmitter binds with receptors associated with the postsynaptic membrane, ligand-gated ion channels open


Which of the following is not a tropic hormone released by the anterior pituitary gland?



Sympathetic stimulation would result in all of the following except for?

stimulate sweat glands, constrict peripheral vessels, increase blood to skeletal muscles, increase chronotropic and inotropic effects, bronchodilation, NRG production, reduce blood flow to abdomen, decrease digestion, relax smooth muscle in bladder, release glucose from liver, dilation of the pupils