Group Quiz 1 Flashcards
Secretion of hormones are controled by all of the following except:
Receptor type in target cells
Trropic hormones
Neural input
Concentration of mineral ions in the blood
Receptor type in target cells
Aldosterone release can be triggered by the presence of the blood-borne messenger angiotensin II or by low sodium levels, so secretion regulation is said to be:
Both hormonal and humoral
Both insulin and glucagon are peptide hormones that target liver cells. The response of target cells to each of these hormones is opposite. This information implies all of the following except:
Both hormones interact w/ receptors at cell nucleus
Each of the two hormones uses a different second messenger
Each hormone activates different pathways in the cell
The two hormones bind to distinct receptors.
Both hormones interact w/ receptors at cell nucleus
What are insulin and glucagon to each other?
Antagonistic
Graves’ disease is a thyroid pathology in which the body produces auto-antibodies that are TSH agonists. These antibodies are not affected by the usual feedback loops. Using this info, predict what will happen with T3 and T4 (thyroid hormones) secretion with Graves’ disease
Decrease
No change
Increase
Increase
A 42-year-old woman has a total hysterectomy and bilateral oophorectomy (removal of both ovaries). What do you expect her hormone levels to look like?
FSH and LH high
Estrogen and progesterone low
Adrenal axis structures and hormones in the appropriate order:
Hypothalamus, coticocrotropin-releasing hormone (CRH), anterior pituitary, ACTH, adrenal cortex, cortisol
Cortisol causes more
Fat storage for short-term survival
Which of the following is/are functions of the human nervous system?
Recieing storing, and processing info in the ext and int environements
Secreteion of rhormones
Coordination of movements
Bringing about changes in physiology and/or behavior to ensure optimal fucntions of homeostatic mechanisms
All the above
All the above
Which of the following is/are functions of the endocrine system?
Recieing storing, and processing info in the ext and int environements
Secreteion of rhormones
Coordination of movements
Bringing about changes in physiology and/or behavior to ensure optimal fucntions of homeostatic mechanisms
All the above
Recieing storing, and processing info in the ext and int environements
Secreteion of rhormones
Bringing about changes in physiology and/or behavior to ensure optimal fucntions of homeostatic mechanisms
Endocrine system changes can be
Semipermanent
Every cell has a
Resting membrane potential (even if not used)
T or F: there is neer an instance in a cell where it is doing nothing
True
Which direction does the Na/K ATPase move ions?
3 sodium out, 2 potassium in
The relative refractory period of an axon coincides with the period of
Activation and inactivation of voltage-dependent Na+ channels
Increased Na+ flux out of the cell
Increased Na+ flux into the cell
Increased K+ flux out of the cell
Increased K+ flux into the cell
Increased K+ flux out of the cell
Continous conduction of nerve impulses occurs only alone
Dendrites
Myelinated axons
Axons in the PNS
Axons in the CNS
Unmyelinated axons
Unmyelinated axons
When a nerotransmitter causes the opening of chemically gated potassium channels in the postsynaptic cell, the postsynaptic potential that results is an:
EPSP, which is a hyperpolarization
EPSP, which is a depolarization
IPSP, which is a hyperpolarization
IPSP, which is a depolarization
IPSP, hyperpolarization
Chemically gated ion chnanels are mainly found in the ____ segment of a neuron.
Receptive
A home satellite dish signals from a satellite, allowing your TV to display shows. What part of a neuron is analogous to a satellite dish?
Dendrite
The major extracellular cation is
Potassium
Magnesium
Sodium
Chloride
Sodium
The diffusion potential for Na+ across a nerve cell membrane
In the same direction as the diffusion potential for potassium
favors its movement out of the cell at the resting position
favors its movement into the cell at the resting position
is equal and opposite to the electrical potential acting on sodium at resting potential
favors its movement into the cell at the resting position
If there are no sodium leak channels, the resting membrane potential of the neurons would be
More positive
More negative
No charge
0 mV
More positive
Autonomic nervous system
Not voluntary at all
(only somatic skeletal muscles)
Receptor potential
Graded potential in a neuron
