BIO 253 Exam 1 Questions And Answers With Verified Solutions
In primary and secondary active transport, at least one substance will move against its - correct
answer concentration gradient
The location of the binding sites on the Na-K pump dictates the _ of solute movement - correct
answer direction
By which two modes of transport does glucose cross the cell membrane? - correct answer SAT
and facilitated diffusion
Which transport processes can be saturated? - correct answer anything with a protein
Where is the Na/K ATPase found in the intestines? - correct answer Basolateral membrane
If a cell were to become depleted of its ATP, which type of membrane transport would be most
directly and immediately affected? - correct answer PAT
As solute concentration of a solution increases, water concentration ___ and osmotic pressure
___ - correct answer decreases, increases
Extracellular fluid becomes hypotonic and brain cells swell - correct answer water toxicity
Multi-unit smooth muscle _ gap junctions and has _ innervation by the autonomic nervous
system - correct answer lacks, dense
In which muscle types does myosin have ATPase activity? - correct answer smooth, cardiac,
skeletal
Which muscle fiber type experiences slow-wave potentials - correct answer smooth
Single-unit smooth muscle _ gap junctions and has _ innervation by the autonomic nervous
system - correct answer has, light
Contraction in smooth muscle is terminated when - correct answer a phosphatase
dephosphorylates myosin
A molecule common to skeletal AND smooth muscle crossbridge cycling - correct answer actin
An overlap of cardiac action potential prevents - correct answer summation
Why do we want to prevent summation? - correct answer so the heart can fill with blood
Three ways in which cardiac muscle is similar to smooth muscle - correct answer gap junctions,
pacemaker cells, innervated by autonomic neurons
Contraction in smooth muscle is initiated when - correct answer calcium binds to calmodulin
In smooth muscle, actin and myosin generate force through the - correct answer crossbridge
cycle
In smooth muscle, thick and thin filaments are arranged _ - correct answer obliquely
, BIO 253 Exam 1 Questions And Answers With Verified Solutions
Smooth muscles have _ sarcoplasmic reticulum than skeletal muscles - correct answer less
The second messenger DAG is - correct answer membrane bound
Ligands that bind to target cell receptors but don't initiate response - correct answer
antagonists
Fastest acting membrane-bound receptors - correct answer channel-linked
Slow ligand-gated channels are regulated by - correct answer g proteins
G proteins are enzymes that allow for an ___ ___ within a target cell - correct answer amplified
response
What happens once adenylate cyclase is activated - correct answer it uses ATP to form cAMP
You can inhibit cAMP by activating - correct answer phosphodiesterase
Is calcium removed from the cytosol of cardiac muscle cells by Ca leak channels in the plasma
membrane? - correct answer no
Is calcium removed from the cytosol of cardiac muscle cells by Ca ATPases in the sarcoplasmic
reticulum? - correct answer yes
Is calcium removed from the cytosol of cardiac muscle cells by Ca/Na exchangers in the plasma
membrane? - correct answer yes
Is calcium removed from the cytosol of cardiac muscle cells by Ca ATPases in the plasma
membrane? - correct answer yes
What can generate an action potential in the heart? - correct answer SA/AV nodes, purkinje
fibers, bundle of His
Which type of membrane junctions are located at intercalated discs? - correct answer gap
junctions and desmosomes
Two symptoms of SA node abnormalities - correct answer bradycardia, tachycardia
What is the T wave? - correct answer repolarization of the ventricles
What is the P wave? - correct answer atrial depolarization
List the order of cardiac impulse conduction - correct answer SA node, AV node, bundle of His,
Purkinje fibers
Why does electrical signaling in the heart begin with the SA node? - correct answer it
depolarizes fastest
What does the QRS complex produce? - correct answer ventricular systole
In primary and secondary active transport, at least one substance will move against its - correct
answer concentration gradient
The location of the binding sites on the Na-K pump dictates the _ of solute movement - correct
answer direction
By which two modes of transport does glucose cross the cell membrane? - correct answer SAT
and facilitated diffusion
Which transport processes can be saturated? - correct answer anything with a protein
Where is the Na/K ATPase found in the intestines? - correct answer Basolateral membrane
If a cell were to become depleted of its ATP, which type of membrane transport would be most
directly and immediately affected? - correct answer PAT
As solute concentration of a solution increases, water concentration ___ and osmotic pressure
___ - correct answer decreases, increases
Extracellular fluid becomes hypotonic and brain cells swell - correct answer water toxicity
Multi-unit smooth muscle _ gap junctions and has _ innervation by the autonomic nervous
system - correct answer lacks, dense
In which muscle types does myosin have ATPase activity? - correct answer smooth, cardiac,
skeletal
Which muscle fiber type experiences slow-wave potentials - correct answer smooth
Single-unit smooth muscle _ gap junctions and has _ innervation by the autonomic nervous
system - correct answer has, light
Contraction in smooth muscle is terminated when - correct answer a phosphatase
dephosphorylates myosin
A molecule common to skeletal AND smooth muscle crossbridge cycling - correct answer actin
An overlap of cardiac action potential prevents - correct answer summation
Why do we want to prevent summation? - correct answer so the heart can fill with blood
Three ways in which cardiac muscle is similar to smooth muscle - correct answer gap junctions,
pacemaker cells, innervated by autonomic neurons
Contraction in smooth muscle is initiated when - correct answer calcium binds to calmodulin
In smooth muscle, actin and myosin generate force through the - correct answer crossbridge
cycle
In smooth muscle, thick and thin filaments are arranged _ - correct answer obliquely
, BIO 253 Exam 1 Questions And Answers With Verified Solutions
Smooth muscles have _ sarcoplasmic reticulum than skeletal muscles - correct answer less
The second messenger DAG is - correct answer membrane bound
Ligands that bind to target cell receptors but don't initiate response - correct answer
antagonists
Fastest acting membrane-bound receptors - correct answer channel-linked
Slow ligand-gated channels are regulated by - correct answer g proteins
G proteins are enzymes that allow for an ___ ___ within a target cell - correct answer amplified
response
What happens once adenylate cyclase is activated - correct answer it uses ATP to form cAMP
You can inhibit cAMP by activating - correct answer phosphodiesterase
Is calcium removed from the cytosol of cardiac muscle cells by Ca leak channels in the plasma
membrane? - correct answer no
Is calcium removed from the cytosol of cardiac muscle cells by Ca ATPases in the sarcoplasmic
reticulum? - correct answer yes
Is calcium removed from the cytosol of cardiac muscle cells by Ca/Na exchangers in the plasma
membrane? - correct answer yes
Is calcium removed from the cytosol of cardiac muscle cells by Ca ATPases in the plasma
membrane? - correct answer yes
What can generate an action potential in the heart? - correct answer SA/AV nodes, purkinje
fibers, bundle of His
Which type of membrane junctions are located at intercalated discs? - correct answer gap
junctions and desmosomes
Two symptoms of SA node abnormalities - correct answer bradycardia, tachycardia
What is the T wave? - correct answer repolarization of the ventricles
What is the P wave? - correct answer atrial depolarization
List the order of cardiac impulse conduction - correct answer SA node, AV node, bundle of His,
Purkinje fibers
Why does electrical signaling in the heart begin with the SA node? - correct answer it
depolarizes fastest
What does the QRS complex produce? - correct answer ventricular systole
