- (A) The bundle of His
- (B) All cardiac muscle
- (C) The sinoatrial node
- (D) The cervical ganglion
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- (A) 30 ml
- (B) 130 ml
- (C) 70 ml
- (D) 5 liters
- (A) Heart rate
- (B) Peripheral resistance
- (C) Systolic blood pressure
- (D) Venous return
- (A) Systolic ejection
- (B) Isovolumetric relaxation
- (C) Isovolumetric contraction
- (D) None of the above
- (A) Does not operate in the failing heart
- (B) Does not operate during exercise
- (C) Explains the increase in cardiac output that occurs when venous return is increased
- (D) Explains the increase in cardiac output when the sympathetic nerves supplying the heart stimulated
- (A) Organ
- (B) Tissues
- (C) Organelle
- (D) Organ System
- (A) Biosphere
- (B) Community
- (C) Population System
- (D) Ecosystem
- (E) Species
- (A) Cells
- (B) Organs
- (C) Organ System
- (D) Organelles
- (A) Nucleus
- (B) Genes
- (C) Chromosomes
- (D) Nucleolus
- (A) Unicellular structures
- (B) Multi-cellular structures
- (C) Sub-cellular structures
- (D) Non-cellular structures
