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Fisiologi Sistem Kardiovaskuler

Authored by NANDA SALAMY

Biology

University

Used 1+ times

Fisiologi Sistem Kardiovaskuler
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30 questions

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1.

OPEN ENDED QUESTION

3 mins • 1 pt

Hukum all or none berlaku, artinya bila atrium atau ventrikel sudah eksitasi, selalu diikuti oleh kontraksi seluruh atrium atau ventrikel.

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2.

OPEN ENDED QUESTION

3 mins • 1 pt

Sifat dasar otot jantung: a. irritability (bathmotropic) = pekat hdrangsang b. conductivity (dromotropic) = menghantarkan rangsang c. contractility (inotropic) = dapat berkontraksi d. rhythmicity (chronotropic) = bersifat ritmis

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3.

OPEN ENDED QUESTION

3 mins • 1 pt

Fase-2 potensial aksi: 0: Depolarisasi 1: Fase repolarisasi cepat awal 2: Plateau 3: Fase repolarisasi cepat akhir 4: Kembali ke resting/baseline

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4.

OPEN ENDED QUESTION

3 mins • 1 pt

Potensial aksi pada otot skelet: Spike potential, RMP = -90 sd -95 mV. Karena periode refrakter pendek ±10 mdet, rangsang berturutan dapat diterima dan menyebabkan tetani.

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5.

OPEN ENDED QUESTION

3 mins • 1 pt

Potensial aksi pada sistem nodal: Tidak mempunyai plateau.

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6.

OPEN ENDED QUESTION

3 mins • 1 pt

Potensial aksi sistem nodal (SA & AV): Potensial aksi dimulai dari pacemaker potential, dengan masuknya Na potensial naik sampai ambang diikuti Ca masuk, Na stop → potensial naik terjal +20mV, kemudian K channel buka, K keluar, potensial turun sampai potensial pacemaker, K channel tutup.

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7.

OPEN ENDED QUESTION

3 mins • 1 pt

Kecepatan hantar impuls: Otot atrium: 0,3 m/det, Junctional fibres: 0,01 m/det, AV node: 0,1 m/det, Otot ventrikel: 0,4 – 0,5 m/det, Purkinje fibres: 1,5 – 4 m/det.

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