

Fisiologi Sistem Kardiovaskuler
Flashcard
•
Biology
•
University
•
Practice Problem
•
Hard
NANDA SALAMY
FREE Resource
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22 questions
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1.
FLASHCARD QUESTION
Front
Apa yang dimaksud dengan hukum all or none dalam fisiologi otot jantung?
Back
Hukum all or none menyatakan bahwa jika atrium atau ventrikel sudah terangsang, maka seluruh atrium atau ventrikel akan berkontraksi secara bersamaan.
2.
FLASHCARD QUESTION
Front
Sebutkan sifat dasar otot jantung!
Back
1. Irritability (bathmotropic) - peka terhadap rangsang 2. Conductivity (dromotropic) - menghantarkan rangsang 3. Contractility (inotropic) - dapat berkontraksi 4. Rhythmicity (chronotropic) - bersifat ritmis.
3.
FLASHCARD QUESTION
Front
Jelaskan fase-fase potensial aksi pada otot jantung!
Back
1. Fase 0: Depolarisasi 2. Fase 1: Fase repolarisasi cepat awal 3. Fase 2: Plateau 4. Fase 3: Fase repolarisasi cepat akhir 5. Fase 4: Kembali ke resting/baseline.
4.
FLASHCARD QUESTION
Front
Apa yang terjadi pada fase plateau dalam potensial aksi otot jantung?
Back
Pada fase plateau, Na channel terbuka dan Na masuk, menyebabkan depolarisasi cepat. Kemudian, Ca channel buka dan K keluar sedikit, diikuti dengan influks Ca yang banyak.
5.
FLASHCARD QUESTION
Front
Apa yang dimaksud dengan periode refrakter absolut pada otot jantung?
Back
Periode refrakter absolut adalah waktu di mana otot jantung tidak dapat dirangsang kembali, berlangsung sekitar 250 ms.
6.
FLASHCARD QUESTION
Front
Sebutkan kecepatan hantar impuls pada berbagai bagian sistem konduksi jantung!
Back
1. Otot atrium: 0,3 m/det 2. Junctional fibres: 0,01 m/det 3. AV node: 0,1 m/det 4. Otot ventrikel: 0,4 - 0,5 m/det 5. Purkinje fibres: 1,5 - 4 m/det.
7.
FLASHCARD QUESTION
Front
Apa fungsi AV junction dalam sistem kardiovaskuler?
Back
AV junction berfungsi untuk memperlambat konduksi ke AV node, memberikan kesempatan bagi atrium untuk menyelesaikan kontraksinya sebelum ventrikel berkontraksi.
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