SISTEM PEREDARAN

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DARAH&

LIMFE

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BELUM MEMILIKI JANTUNG VERTEBRATA

MEMILIKI BAGIAN/DAERAH SISTEM PEREDARAN YANG BERSIFAT KONTRAKTIL & BERFUNGSI UNTUK MEMOMPA DARAH

ORGAN KONTRAKTIL TERSEBUT TERLETAK DIANTARA : DUKTUS CUVIERI, AORTA VENTRAL & VENA HEPATIKA

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VENA BESAR

KELEP SINOATRIAL

KELEP ATRIOVENTRIKULAR

KELEP SEMILUNAR

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AORTA VENTRAL

AORTA DORSAL

AORTA LATERAL DORSAL

KAPILER INSANG

VENTRICLE

ATRIUM

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Vena Pulmonalis

Ventrikel

Carotid Interna

Carotid Externa

ATRIUM ATRIUM

VENTRICLE

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Ventrikel

Vena Pulmonalis

Foramen Panizzae

AORTA

LEFT ATRIUMRIGHT

ATRIUM

VENTRICLES

RIGHT ARCH

LEFT ARCH

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Role of the Foramen of Panizza in the crocodilian circulatory system:

When a crocodilian is above water and breathing air, the semilunar valve in the right aorta remains closed because of higher pressure in the left & right aorta (higher than in the right ventricle). As a result, the right aorta receives blood from the left aorta (so both aortas carry oxygenated blood) and blood from the right ventricle (low in oxygen) passes only into the pulmonary artery (and goes to the lungs).

When a crocodilian is under water and not breathing, right ventricular pressure increases due to pulmonary resistance (vasoconstriction of blood vessels supplying the lungs). As a result, the semilunar valve in the right aorta is now forced open so some of the blood from the right ventricle now enters the right aorta rather than the pulmonary artery. This means that, rather than going to the lungs (where there is little or no oxygen anyway because the crocodilian is under water & not breathing), some of the blood enters the systemic (body) circulation. This means that vital organs & tissues (such as skeletal muscles and the central nervous system) will get an increased blood supply and additional oxygen. This, in turn, allows a crocodilian to stay underwater longer (which is most important because many crocodilians hunt by remaining underwater and 'ambushing' prey that come for a drink or to cool off).

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R.A

R.VVentrikel

Vena Pulmonalis

LENGKUNG AORTA KANAN

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Vena Pulmonalis

Ventrikel

ATRIUM

VENTRICLE

ATRIUM

VENTRICLE

LENGKUNG AORTA

KIRI

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JANTUNG

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SECARA HISTOLOGIS, JANTUNG TERDIRI DARI :

1. TUNIKA INTERNA (ENDOKARDIUM)

TERSUSUN ATAS SEL ENDOTELIUM PIPIH & LAPISAN SUBENDOTELIUM YANG TEBAL (JARINGAN IKAT, OTOT POLOS & SERABUT ELASTIS)

LAPISAN SUBENDOKARDIAL (JARINGAN IKAT YANG MENGANDUNG VENA, SARAF & CABANG-CABANG SISTEM PENGHANTAR IMPULS)

2. TUNIKA MEDIA (MIOKARDIUM)

TERDIRI ATAS SEL-SEL OTOT JANTUNG : 1. KONTRAKTIL, 2. YANG MENIMBULKAN & MENGHANTARKAN IMPULS

3. TUNIKA EKSTERNA (EPIKARDIUM)

LAPISAN VISERAL PERIKARDIUM YANG MEMBUNGKUS JANTUNG, TERDIRI DARI JARINGAN IKAT (SERABUT KOLAGEN, ELASTIN & SEL-SEL LEMAK) & SEL EPITEL PIPIH (MESOTEL)

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JANTUNG MAMALIA TERDIRI ATAS 4 RUANGAN, YAITU : ATRIUM KIRI, ATRIUM KANAN, VENTRIKEL KIRI & VENTRIKEL KANAN

DARAH DARI SELURUH TUBUH ATRIUM KANAN

LUBANG ATRIO-VENTRIKULAR KANAN (VALVULAE

TRIKUSPIDALIS VENTRIKEL KANAN ARTERI

PULMONALIS PULMO DGN VALVULAE SEMILUNARIS

DARAH DARI PARU-PARU VENA PULMONALIS

ATRIUM KIRI LUBANG ATRIO-VENTRIKULAR KIRI

(VALVULAE BIKUSPIDALIS =VALVULA MITRALIS)

VENTRIKEL KIRI TRUNKUS AORTIKUS DGN

VALVULAE SEMILUNARIS

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AORTA

ARTERI PULMONER

ATRIUM KIRI

KATUP SEMILUNAR

VENA PULMONER

KATUP ATRIOVENTRIKEL

(BICUSPIDALIS)

VENTRIKEL KIRIVENTRIKEL KANAN

VENA CAVA POSTERIOR

KATUP ATRIOVENTRIKEL

(TRICUSPIDALIS)

KATUP SEMILUNAR

VENA PULMONER

ATRIUM KANAN

VENA CAVA ANTERIOR

ARTERI PULMONER

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