(b) ECG is the recording of electrical changes that accompany the cardiac cycle. Normal ECG is composed of P-wave, QRS-wave and T-wave. The $P$-wave indicates atrial depolarization, which causes atrial systole. QRS-wave represents ventricular depolarization. The $T$-wave represents repolarization of ventricles.
NCERT Page-286 / N-201
BODY FLUIDS and CIRCULATION(NCERT)
285963
Which have 4-chambered heart?
1 Reptiles
2 Amphibians
3 Crocodiles
4 Fishes
Explanation:
(b) Crocodiles have 4-chambered heart.
NCERT Page-282 / N-197
BODY FLUIDS and CIRCULATION(NCERT)
285964
Which one of the following is a matching pair?
1 Lub-Sharp closure of AV valves at the beginning of ventricular systole.
2 Dup-Sudden opening of semilunar valves at the beginning of ventricular diastole.
3 Pulsation of the radial artery-Valves in the blood vessels.
4 Purkinje fibres-Initiation of the heart beat,
Explanation:
(a) Lub is the first heart sound. It is associated with the closure of the tricuspid and bicuspid valves at the beginning of systole and opening of semilunar valves.
NCERT Page-285 / N-200
BODY FLUIDS and CIRCULATION(NCERT)
285965
In which of the following options the types of heart is correctly matched to their respective group of animals?
1 Two chambered heart- Fishes and amphibians
2 Three chambered heart-Amphibians and birds
3 Four chambered heart- Birds and mammals
4 Three chambered heart- Reptiles and mammals
Explanation:
(c) Fishes have two-chambered hearts. Amphibians and reptiles have three chambered hearts. Birds and mammals have four chambered hearts.
(b) ECG is the recording of electrical changes that accompany the cardiac cycle. Normal ECG is composed of P-wave, QRS-wave and T-wave. The $P$-wave indicates atrial depolarization, which causes atrial systole. QRS-wave represents ventricular depolarization. The $T$-wave represents repolarization of ventricles.
NCERT Page-286 / N-201
BODY FLUIDS and CIRCULATION(NCERT)
285963
Which have 4-chambered heart?
1 Reptiles
2 Amphibians
3 Crocodiles
4 Fishes
Explanation:
(b) Crocodiles have 4-chambered heart.
NCERT Page-282 / N-197
BODY FLUIDS and CIRCULATION(NCERT)
285964
Which one of the following is a matching pair?
1 Lub-Sharp closure of AV valves at the beginning of ventricular systole.
2 Dup-Sudden opening of semilunar valves at the beginning of ventricular diastole.
3 Pulsation of the radial artery-Valves in the blood vessels.
4 Purkinje fibres-Initiation of the heart beat,
Explanation:
(a) Lub is the first heart sound. It is associated with the closure of the tricuspid and bicuspid valves at the beginning of systole and opening of semilunar valves.
NCERT Page-285 / N-200
BODY FLUIDS and CIRCULATION(NCERT)
285965
In which of the following options the types of heart is correctly matched to their respective group of animals?
1 Two chambered heart- Fishes and amphibians
2 Three chambered heart-Amphibians and birds
3 Four chambered heart- Birds and mammals
4 Three chambered heart- Reptiles and mammals
Explanation:
(c) Fishes have two-chambered hearts. Amphibians and reptiles have three chambered hearts. Birds and mammals have four chambered hearts.
(b) ECG is the recording of electrical changes that accompany the cardiac cycle. Normal ECG is composed of P-wave, QRS-wave and T-wave. The $P$-wave indicates atrial depolarization, which causes atrial systole. QRS-wave represents ventricular depolarization. The $T$-wave represents repolarization of ventricles.
NCERT Page-286 / N-201
BODY FLUIDS and CIRCULATION(NCERT)
285963
Which have 4-chambered heart?
1 Reptiles
2 Amphibians
3 Crocodiles
4 Fishes
Explanation:
(b) Crocodiles have 4-chambered heart.
NCERT Page-282 / N-197
BODY FLUIDS and CIRCULATION(NCERT)
285964
Which one of the following is a matching pair?
1 Lub-Sharp closure of AV valves at the beginning of ventricular systole.
2 Dup-Sudden opening of semilunar valves at the beginning of ventricular diastole.
3 Pulsation of the radial artery-Valves in the blood vessels.
4 Purkinje fibres-Initiation of the heart beat,
Explanation:
(a) Lub is the first heart sound. It is associated with the closure of the tricuspid and bicuspid valves at the beginning of systole and opening of semilunar valves.
NCERT Page-285 / N-200
BODY FLUIDS and CIRCULATION(NCERT)
285965
In which of the following options the types of heart is correctly matched to their respective group of animals?
1 Two chambered heart- Fishes and amphibians
2 Three chambered heart-Amphibians and birds
3 Four chambered heart- Birds and mammals
4 Three chambered heart- Reptiles and mammals
Explanation:
(c) Fishes have two-chambered hearts. Amphibians and reptiles have three chambered hearts. Birds and mammals have four chambered hearts.
(b) ECG is the recording of electrical changes that accompany the cardiac cycle. Normal ECG is composed of P-wave, QRS-wave and T-wave. The $P$-wave indicates atrial depolarization, which causes atrial systole. QRS-wave represents ventricular depolarization. The $T$-wave represents repolarization of ventricles.
NCERT Page-286 / N-201
BODY FLUIDS and CIRCULATION(NCERT)
285963
Which have 4-chambered heart?
1 Reptiles
2 Amphibians
3 Crocodiles
4 Fishes
Explanation:
(b) Crocodiles have 4-chambered heart.
NCERT Page-282 / N-197
BODY FLUIDS and CIRCULATION(NCERT)
285964
Which one of the following is a matching pair?
1 Lub-Sharp closure of AV valves at the beginning of ventricular systole.
2 Dup-Sudden opening of semilunar valves at the beginning of ventricular diastole.
3 Pulsation of the radial artery-Valves in the blood vessels.
4 Purkinje fibres-Initiation of the heart beat,
Explanation:
(a) Lub is the first heart sound. It is associated with the closure of the tricuspid and bicuspid valves at the beginning of systole and opening of semilunar valves.
NCERT Page-285 / N-200
BODY FLUIDS and CIRCULATION(NCERT)
285965
In which of the following options the types of heart is correctly matched to their respective group of animals?
1 Two chambered heart- Fishes and amphibians
2 Three chambered heart-Amphibians and birds
3 Four chambered heart- Birds and mammals
4 Three chambered heart- Reptiles and mammals
Explanation:
(c) Fishes have two-chambered hearts. Amphibians and reptiles have three chambered hearts. Birds and mammals have four chambered hearts.
