Structure of Heart of Scoliodon

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

Highly contractile and origin of heart's beating

Where is the heart situated in the body of scoliodon?

Between two series of gill pouches

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

Large, triangular, and thin-walled chamber

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

Auricle

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

Venous blood from all parts of the body

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

Its inner surface with muscular strands

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

Conus arteriosus

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

Prevents friction and keeps the heart moist

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

Ventricle

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

Ventricle

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

Endocardium

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

In the pleuroperitonial cavity

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

Conus arteriosus

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

Deoxygenated blood only

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

Ventricle

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

blood

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

ventral

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

valves

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

venous

The ventricle has a very thick ______ wall

muscular

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

muscular

The conus arteriosus is continued forward as the ______

ventral aorta

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

atrium

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

heart

The blood vascular system of the frog is ______

closed

The space between the heart and pericardium is filled with ______

serous fluid

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

ventricle

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

pleuroperitonial

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

semilunar

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

epicardium

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

atrium

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.

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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