50 Questions
Which chamber of the fish heart is responsible for receiving deoxygenated blood?
Sinus venosus
Which type of fish has a non-contractile bulbous arteriosus in their circulatory system?
Teleosts
Which layer of the fish heart depends on oxygen reserves and nutrients in venous blood?
Spongy myocardium
Which region of the fish heart initiates the electrical signal for contraction?
Sinoatrial region
What is the formula for calculating cardiac output in fish?
Q = fH x SVH
What is the term for the positive effect on heart rate?
Chronotropic effect
Which type of swimming leads to a decrease in cardiac output and arterial pressure recovery?
Burst swimming
What is the range of increase in stroke volume during endurance swimming in fish?
50 to 200%
What is the effect of temperature on cardiac output in fish?
Q increases with temperature
What is the value of Q10, a measure of the increase in metabolic rate with temperature, for cardiac output in fish?
1.6 to 2
Which mechanism is responsible for increasing stroke volume with greater ventricular filling?
Frank-Starling Mechanism
What is the effect of epinephrine on contractility in the heart?
Increases contractility
Which factor is NOT a positive inotropic factor for cardiac filling?
Hypoxia
Which nervous system is responsible for the 'fight or flight' response?
Sympathetic Nervous System
Which nerve innervates the SA region of the heart?
Vagus Nerve
What is the intrinsic heart rate determined by in fish?
Blocking both adrenergic and cholinergic receptors
Where are epinephrine and norepinephrine released in the fish cardiovascular system?
Chromaffin tissue outside the heart
What is the primary function of hemoglobin in fish?
Maximize O2 uptake at the gills
What happens to Hb-O2 affinity when hemoglobin is oxygenated?
It increases
How many chambers does the fish heart have?
4
Which chamber of the fish heart is responsible for receiving oxygenated blood?
Atrium
What is the function of the conal valves in lampreys and elasmobranchs?
To deliver continuous flow
Which type of fish has a non-contractile bulbous arteriosus in their circulatory system?
Teleosts
Which layer of the fish heart depends on oxygen reserves and nutrients in venous blood?
Spongy myocardium
What is the term for the positive effect on heart rate?
Tachycardia
Which type of swimming leads to a decrease in cardiac output and arterial pressure recovery?
Burst swimming
What is the effect of temperature on cardiac output in fish?
Cardiac output increases with increasing temperature
What is the range of increase in stroke volume during endurance swimming in fish?
150 to 200%
What is the formula for calculating cardiac output in fish?
Q = fH x SVH
Which nerve innervates the sinoatrial region of the fish heart?
Vagus nerve
Which factor does NOT influence stroke volume in fish?
ESV
Which of the following is NOT a positive inotropic factor for cardiac filling in fish?
Hypoxia
What is the formula for calculating stroke volume in fish?
SVH = EDV - ESV
Which of the following is NOT a factor influencing cardiac filling in fish?
Acetylcholine
Which of the following is NOT a negative inotropic factor for cardiac filling in fish?
Alpha-adrenergic stimulation
Which of the following is NOT controlled by the sympathetic nervous system in fish?
Heart rate
Which of the following is NOT a target site for epinephrine and norepinephrine in the fish cardiovascular system?
Chromaffin tissue outside heart
Which of the following is NOT innervated by the vagus nerve in the fish heart?
Coronary vessels
What is the term for the negative effect on heart rate?
Dromotropy
What is the effect of epinephrine on contractility in the fish heart?
Increases contractility
True or false: Hypoxia increases stroke volume in fish.
False
True or false: The Frank-Starling mechanism is influenced by cardiac filling pressure.
True
True or false: The sympathetic nervous system increases contractility in fish.
True
True or false: Hypoxia is a negative inotropic factor for cardiac filling in fish.
True
True or false: The vagus nerve innervates the ventricle of the fish heart.
False
The fish circulatory system includes a sinus venosus, atrium, ventricle, and conus arteriosus.
True
The bulbous arteriosus in teleost fish is a non-contractile chamber with a single bulbal valve.
True
The ventricular walls in fish are composed of dense compact myocardium and spongy myocardium.
True
Fish hearts rely on myogenic activity, with electrical signals initiated in the sinoatrial region.
True
The cardiac output in fish is determined by the heart rate and stroke volume.
True
Test your knowledge on the fish circulatory system and comparative anatomy of the heart. This quiz covers topics such as hemoglobins, sinus venosus, atrium, ventricle, conus arteriosus, and bulbous arteriosus. See how well you understand the fish circulatory system with this quiz!
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