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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KELEP SEMILUNAR KELEP ATRIOVENTRIKULAR

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KELEP SINOATRIAL VENA BESAR

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AORTA VENTRAL AORTA LATERAL DORSAL KAPILER INSANG VENTRICLE ATRIUM AORTA DORSAL

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Carotid Externa Carotid Interna Ventrikel ATRIUM VENTRICLE Vena Pulmonalis

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ATRIUM

11

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RIGHT ATRIUM RIGHT ARCH Foramen Panizzae VENTRICLES Ventrikel Vena Pulmonalis

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LEFT ATRIUM LEFT ARCH AORTA

13

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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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LENGKUNG AORTA KANAN

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R.V

R.A

Ventrikel Vena Pulmonalis

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LENGKUNG AORTA KIRI ATRIUM VENTRICLE Ventrikel Vena Pulmonalis

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ATRIUM VENTRICLE

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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) 26 Maret 2010 Struktur Hewan/Any Aryani/Bio 22

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 26 Maret 2010 Struktur Hewan/Any Aryani/Bio 23

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ARTERI PULMONER VENA CAVA ANTERIOR ATRIUM KANAN VENA PULMONER KATUP SEMILUNAR KATUP ATRIOVENTRIKEL (TRICUSPIDALIS) VENA CAVA POSTERIOR VENTRIKEL KANAN

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AORTA ARTERI PULMONER ATRIUM KIRI VENA PULMONER KATUP SEMILUNAR KATUP ATRIOVENTRIKEL (BICUSPIDALIS) VENTRIKEL KIRI

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