Human Physiology-Week 6 Quiz: Ch 12,13,14,15
The contraction cycle is initiated by the rise in ________ released from the sarcoplasmic reticulum (SR).
Ca2+
Match each term with its definition. A. cardiac output (CO) B. heart rate (HR) C. end-diastolic volume (EDV) D. stroke volume (SV) E. end-systolic volume (ESV) the volume of blood circulated by the heart in one minute
Cardiac output (CO)
A patient is born with a mutation in her calmodulin gene. This could affect the contraction of ________ muscles.
smooth
Which would decrease peripheral resistance?
vasodilation
In which situation would end-systolic volume (ESV) be the greatest?
when parasympathetic stimulation of the heart is increased
Match the structure to its description. A. muscle spindles B. Golgi tendon organs C. both have afferent neurons that bring information to the CNS
Both
Match each term with its definition. A. cardiac output (CO) B. heart rate (HR) C. end-diastolic volume (EDV) D. stroke volume (SV) E. end-systolic volume (ESV) the amount of blood left in the ventricle after it contracts
End-systoloc volume (ESV)
Match the structure to its description. A. muscle spindles B. Golgi tendon organs C. both found at the junction of tendons and muscle fibers
Golgi tendon organs
Your instructor announces a pop quiz. Which would you expect?
Increased sympathetic signaling and increased cardiac output
If increased blood pressure stimulated the baroreceptor reflex, which changes would occur?
Increased vessel diameter, decreased resistance, and decreased cardiac output
Match the name of the wave with the correlated event. A. P wave B. QRS complex C. T wave D. PR segment E. ST segment atrial depolarization
P wave
Match the name of the wave with the correlated event. A. P wave B. QRS complex C. T wave D. PR segment E. ST segment Atrial contraction
PR segment
Match the name of the wave with the correlated event. A. P wave B. QRS complex C. T wave D. PR segment E. ST segment Immediately followed by ventricular contraction.
QRS complex
Match the name of the wave with the correlated event. A. P wave B. QRS complex C. T wave D. PR segment E. ST segment ventricular depolarization
QRS complex
Match the name of the wave with the correlated event. A. P wave B. QRS complex C. T wave D. PR segment E. ST segment isoelectric line that follows the QRS complex and connects it to the T wave / the end of ventricular depolarization and the beginning of ventricular repolarization
ST segment
Match the name of the wave with the correlated event. A. P wave B. QRS complex C. T wave D. PR segment E. ST segment ventricular repolarization
T wave
What happens when calcium binds troponin?
Tropomyosin is pulled away from the myosin-binding site on actin.
Which would NOT cause an increase in blood pressure?
a decrease in cardiac output
Which is greater? blood pressure when parasympathetic stimulation to the heart increases blood pressure when sympathetic stimulation to the heart increases
blood pressure when sympathetic stimulation to the heart increases
Which is greater? blood pressure when the peripheral vessels constrict blood pressure when the peripheral vessels dilate
blood pressure when the peripheral vessels constrict
During the plateau phase of the action potentials of myocardial contractile cells, which ion(s) is/are crossing the membrane?
both Ca2+ and K+
The P wave of an ECG corresponds to
depolarization of the atria.
The action potential traveling along the t-tubule changes the conformation of the
dihydropyridine (DHP) receptor (L-type calcium channel).
Match each term with its definition. A. cardiac output (CO) B. heart rate (HR) C. end-diastolic volume (EDV) D. stroke volume (SV) E. end-systolic volume (ESV) the volume of blood in the ventricle available to be pumped out of the heart during one contraction
end-diastolic volume (EDV)
The term used to describe the amount of blood in the ventricle available to be pumped out of the heart during the next contraction is
end-diastolic volume (EDV).
Match each term with its definition. A. cardiac output (CO) B. heart rate (HR) C. end-diastolic volume (EDV) D. stroke volume (SV) E. end-systolic volume (ESV) the volume of blood left in the ventricle after it contracts
end-systolic volume (ESV)
Increased blood volume ________ blood pressure.
increases
Restoring lost fluid from the capillaries back to the circulatory system is one of the major functions of the ________ system.
lymphatic
Match the structure to its description. A. muscle spindles B. Golgi tendon organs C. both have gamma motor neurons that innervate internal fibers / maintain muscle tone at rest through tonic activity / eventually synapses with alpha motor neurons that innervate extrafusal muscle fibers
muscle spindles
This protein is activated by the Ca2+-calmodulin complex to phosphorylate the myosin light chain protein.
myosin light chain kinase
An important difference between single-unit and multiunit smooth muscle is the
numerous gap junctions in single-unit smooth muscle, which allow many cells to work together as a sheet.
A motor unit consists of
one neuron and all the skeletal muscle fibers it controls.
The driving force for blood flow is a(n) ________ gradient.
pressure
The cardiac output is equal to the
product of heart rate and stroke volume.
The function of transverse tubules is to
rapidly move action potentials to the interior of the muscle fiber.
Striated muscles are so-called because of a repeating pattern of light and dark bands. One repeating unit of the banding pattern is called a
sarcomere.
Match each term with its definition. A. cardiac output (CO) B. heart rate (HR) C. end-diastolic volume (EDV) D. stroke volume (SV) E. end-systolic volume (ESV) the volume of blood pumped out of the heart from one ventricle during one contraction
stroke volume (SV)
The volume of blood ejected from each ventricle during a contraction is called the
stroke volume.
The H zone contains
thick filaments only.
The I band contains
thin filaments only.
At an intercalated disc,
two cardiac muscle cells are connected by gap junctions.
