All MCQs

The nervous system can control glandular secretion through autonomic pathways. Glands act as effectors responding to neural signals.

The neuron cell body contains the nucleus and organelles needed for protein synthesis and cell maintenance. It integrates many incoming signals.

All sensory receptors detect specific internal or external stimuli and begin signaling pathways that inform the nervous system.

Mechanosensory systems such as the lateral line detect environmental changes at a distance, improving survival in aquatic habitats.

Cones are photoreceptors that detect different wavelengths of light, allowing color vision where multiple cone types are present.

Rods are retinal photoreceptors specialized for low-light vision. Cones support color and high-acuity vision in many vertebrates.

Internal chemoreceptors can detect gases or pH changes and help regulate breathing and circulation. This supports homeostasis.

Interneurons lie within the CNS or ganglia and connect sensory and motor pathways. They are essential for processing, reflexes, and decision-making.

Diffuse nerve nets spread signals through the body and support simple coordinated responses. They are common in cnidarians.

Cephalopods have large brains and advanced sensory systems for invertebrates. Their behavior includes learning, camouflage, and complex movement control.

Nodes of Ranvier are gaps in myelin where ion exchange occurs. Saltatory conduction between nodes increases impulse speed.

Dendrites increase the receptive surface of a neuron. Multiple dendrites allow integration of inputs from several neurons or receptors.