Structure of Heart of Scoliodon
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Structure of Heart of Scoliodon

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Questions and Answers

What is the function of the sinus venosus in the heart of scoliodon?

  • Receiving venous blood from all parts of the body
  • Highly contractile and origin of heart's beating (correct)
  • Opening into the auricle
  • Guarding the auriculo-ventricular aperture

    • Where is the heart situated in the body of scoliodon?

  • Within the brain cavity
  • Between two series of gill pouches (correct)
  • Dorsally placed next to the liver
  • Ventrally placed near the tail

    • What is the structure of the auricle in the heart of scoliodon?

  • Tubular and highly contractile chamber
  • Large, triangular, and thin-walled chamber (correct)
  • Thin-walled chamber dorsally placed near the liver
  • Thick, muscular, and spongy chamber

    • What does the ventricle of the heart of scoliodon communicate with through a slit-like aperture?

    <p>Auricle</p> Signup and view all the answers

    What do the receiving chambers (sinus venosus and auricle) in the heart of scoliodon receive?

    <p>Venous blood from all parts of the body</p> Signup and view all the answers

    What gives the ventricle of the heart of scoliodon a spongy texture?

    <p>Its inner surface with muscular strands</p> Signup and view all the answers

    What is the name of the stout median muscular tube arising from the ventricle in the heart of a frog?

    <p>Conus arteriosus</p> Signup and view all the answers

    What is the function of the serous or pericardial fluid found between the outer pericardium and inner epicardium of the frog's heart?

    <p>Prevents friction and keeps the heart moist</p> Signup and view all the answers

    What part of the heart is designated as the venous or branchial heart in the context of frog anatomy?

    <p>Ventricle</p> Signup and view all the answers

    Which chamber of the frog's heart is conical in shape with thick muscular walls?

    <p>Ventricle</p> Signup and view all the answers

    What does the garden lizard's (Calotes) heart contain between the heart and pericardium?

    <p>Endocardium</p> Signup and view all the answers

    Where is the heart of the garden lizard (Calotes) placed?

    <p>In the pleuroperitonial cavity</p> Signup and view all the answers

    What part of the frog's heart is continued forward as the ventral aorta?

    <p>Conus arteriosus</p> Signup and view all the answers

    What type of blood circulates through the frog's heart?

    <p>Deoxygenated blood only</p> Signup and view all the answers

    What constitutes the most prominent part of the frog’s heart?

    <p>Ventricle</p> Signup and view all the answers

    The circulatory system of scoliodon consists of the circulatory fluid called ______

    <p>blood</p> Signup and view all the answers

    The heart is situated on the ______ side of the body between two series of gill pouches

    <p>ventral</p> Signup and view all the answers

    The sinus venosus opens into the auricle by sinuauricular aperture which is guarded by a pair of ______

    <p>valves</p> Signup and view all the answers

    The receiving chambers (sinus venosus and auricle) receive the ______ blood from all parts of the body

    <p>venous</p> Signup and view all the answers

    The ventricle has a very thick ______ wall

    <p>muscular</p> Signup and view all the answers

    Its inner surface gives many ______ strands, which gives it a spongy texture

    <p>muscular</p> Signup and view all the answers

    The conus arteriosus is continued forward as the ______

    <p>ventral aorta</p> Signup and view all the answers

    The broader part of the frog's heart contains two ______ or auricles

    <p>atrium</p> Signup and view all the answers

    The ventricle is the most conspicuous and prominent part of the ______

    <p>heart</p> Signup and view all the answers

    The blood vascular system of the frog is ______

    <p>closed</p> Signup and view all the answers

    The space between the heart and pericardium is filled with ______

    <p>serous fluid</p> Signup and view all the answers

    The conus arteriosus is a stout median muscular tube arising from the ______

    <p>ventricle</p> Signup and view all the answers

    The heart of the garden lizard (Calotes) is placed in the anterior part of the ______ cavity

    <p>pleuroperitonial</p> Signup and view all the answers

    The lumen of the conus arteriosus is provided with two transverse rows of ______ valves

    <p>semilunar</p> Signup and view all the answers

    The heart is enclosed within a sac formed of two membranes, an outer pericardium and an inner ______ which closely invests the heart

    <p>epicardium</p> Signup and view all the answers

    The broader part of the heart contains two ______ or auricles, whereas the posterior part has a single ventricle

    <p>atrium</p> Signup and view all the answers

    Study Notes

    Heart Structure and Function in Scoliodon

    • The sinus venosus functions as a receiving chamber in the heart of scoliodon.
    • The heart is situated on the ventral side of the body between two series of gill pouches.
    • The sinus venosus receives deoxygenated blood from all parts of the body.

    Heart Structure and Function in Frog

    • The auricle in the heart of the frog has a conical shape with thick muscular walls.
    • The ventricle communicates with the conus arteriosus through a slit-like aperture.
    • The ventricle has a spongy texture due to its inner surface giving many trabecular strands.
    • The conus arteriosus is a stout median muscular tube arising from the ventricle.
    • The conus arteriosus is continued forward as the ventral aorta.
    • The heart is designated as the venous or branchial heart in the context of frog anatomy.
    • The blood vascular system of the frog is a closed system.
    • Oxygenated and deoxygenated blood circulate through the frog's heart.

    Heart Structure and Function in Garden Lizard (Calotes)

    • The heart of the garden lizard contains serous or pericardial fluid between the heart and pericardium.
    • The heart is placed in the anterior part of the thoracic cavity.
    • The heart has a broad anterior part with two auricles and a posterior part with a single ventricle.

    Heart Enclosure and Valves

    • The heart is enclosed within a sac formed of two membranes: an outer pericardium and an inner epicardium which closely invests the heart.
    • The lumen of the conus arteriosus is provided with two transverse rows of valves.
    • The sinus venosus opens into the auricle by a sinuauricular aperture guarded by a pair of valves.

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    Test your knowledge on the structure of the heart of Scoliodon, including its components and their functions within the circulatory system.

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