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Section 5 of the Chapter 3 of the book "Sensory Systems Neuroscience" is presented. It concludes the role branchial chemoreceptors in initiating the reflex responses that adjust cardiorespiratory function to meet the requirements of the fish. It mentions the limited information on the mechanisms of chemotransduction underlying the excitation of fish chemoreceptor cells by hypoxic and hypercapnic/acidic stimuli.

Section 4 of the Chapter 3 of the book "Sensory Systems Neuroscience" is presented. It describes the efferent mechanisms responsible for the activation of vascular resistance and pressor responses to hypoxia and hypercapnia. It discusses the inhibitory effect of vagal motor output on cardiac function that is mediated by the action of acetylcholine released from efferent terminals on muscarinic cholinergic receptors.

Section 3 of the Chapter 3 of the book "Sensory Systems Neuroscience" is presented. It discusses the anatomical location of oxygen-sensitive chemoreceptors. It describes the neuroepithelial cells of the gill epithelium and a road map for determining the signal transduction mechanisms present in fish branchial chemoreceptors.

Section 2 of the Chapter 3 of the book "Sensory Systems Neuroscience" is presented. It describes the various responses mediated by chemoreceptor activation. It discusses the functional significance of hyperventilation during aquatic hypercapnia and the ventilatory effect of environmental hypercapnia in water breathers.

Section 1 of the Chapter 3 of the book "Sensory Systems Neuroscience" is presented. It introduces the topics about branchial chemoreceptor regulation of cardiorespiratory function. The objective which is to provide a synthesis of current knowledge on oxygen and carbondioxide/pH-based chemoreflexive regulation of cardiorespiratory function in fish is mentioned.