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30 terms

quiz 1 ch 1 & 3

STUDY
PLAY
Blood clotting is an example of positive feedback since the action of the effector amplifies that of the stimulus.
T
____________ and ____________ are often regulators of effectors in most feedback loops.
Hormones; nerves
An integrating center of a negative feedback loop has the function of analyzing information from many different sensors about deviations from a set point and then altering the activity of particular effectors to compensate for the deviation.
T
An integrating center sends information to a(n)
Effector
The osmotic pressure of a solution is directly related to its ___________ concentration.
Solute
Carrier proteins function in
Both A and B are correct
Hydrophobic molecules usually enter a cell via ____________.
Diffusion
Glucose entry into the cell is by facilitated diffusion.
True
Endocrine glands secrete _____.
Hormones
The Na+/K+ pump creates a ____________ charge inside the cell.
Negative
Diffusion is more rapid in cells with microvilli compared to cells lacking microvilli
True
Simple diffusion may involve all of the following except
carrier proteins
Homeostasis is maintained using _____.
Both A and B are correct
A decrease in mean arterial pressure is detected by
A sensor
Diffusion is more rapid in cells with microvilli compared to cells lacking microvilli.
T
Passive transport of water is known as
Osmosis
Cells placed in hypotonic solutions will
Increase in volume
Active transport proteins are often regulated by phosphorylation.
T
The rate of diffusion is influenced by
All of these choices are correct
The movement of glucose across the plasma membrane occurs via _____.
facilitated diffusion
Ion channels that can be opened by physiological stimuli are said to be
Gated
Fixed phagocyte cells do not
exhibit amoeboid movement.
An integrating center sends information to a(n)
Effector
Blood clotting is an example of positive feedback since the action of the effector amplifies that of the stimulus.
T
When an internal condition deviates from its _____, a negative feedback loop is activated.
set point
Hyperkalemia would ____________ the resting membrane potential of the cell.
Decrease
Cells placed in hypotonic solutions will
Increase in volume
The charge difference across a membrane produces the membrane potential
T
Passive transport across a plasma membrane may be accomplished with the aid of specific carrier proteins.
T
Facilitated diffusion and active transport differ with regard to the direction of solute movement relative to the concentration gradient.
T