Welcome to your Edexcel B Control Systems Which ions receive the action potential from the T-tubules? Ca2+ Na+ K+ Mg2+ Stimulation during negative feedback follows the path Hypothalamus > Anterior pituitary > Adrenal cortex Adrenal cortex > Anterior pituitary > Hypothalamus Hypothalamus > Adrenal cortex > Anterior pituitary Adrenal cortex > Hypothalamus > Anterior pituitary The small, uncovered areas of an axon between Schwann cells. Nodes of Ranvier Terminal branches Synaptic knob Dendrite Which of the following is responsible for saltatory conduction in myelinated neurons? Nodes of Ranvier Axon membranes Schwann cells Voltage-gated channel proteins Uneven growth of different plant parts in response to light is due to Uneven distribution of IAA Uneven distribution of cytokinin Concentration of phytochrome in leaves only Non-reversibility of phytochromes in the stem Which of the following is not a part of nervous system? Membrane Cell body Axon Dendrite Myelin sheath acts as An electrical insulator An electrical consuctor Signal sender from cell body to neurons Support for node of Ranvier Myelin sheath is produced By Schwann cells in the PNS By motor neurons in the CNS By sensory neurons in the ANS By Axons in the CNS In myelinated neurons, impulses jump from one node to the next. This is called Saltatory conduction Salt conduction Saltory conduction Ranvier conduction Which statement is true for resting and threshold phases of generation of action potential? Na-inactivation gates are open and K-gates are closed Na-activation gates are open and K-gates are closed Na-gates are open and K-gates are closed Both Na-gates as well as K-gates are open Which of these contain synaptic vesicles filled with neurotransmitters? Synaptic knob Synaptic cleft Synaptic divergence Synaptic effector The colour sensitivity of rod cells include Black and white Blue and green Red and blue Violet and red Retinal and opsin are parts of Rhodopsin Conesin Fovea Phototropin In the dark, rod cells are not stimulated because Sodium ions diffuse back in the cell through sodium channels "Closure of sodium ion channels in which sodium ions are actively transported out " No inhibition of bipolar neurons occurs The cell membrane becomes hyperpolarised Cells that produce a response to a stimulus are called Effectors Neurotransmitters Sensory neurons Fovea Which of the following represent the two states of phytochromes Pr-660 nm & Pfr-730 nm Pr-640 nm & Pfr-720 nm Pr-480 nm & Pfr-700 nm Pr-730 nm & Pfr-660 nm The response in plants controlled by phytochromes is Flowering Fruitation Growth Transport The cortex is the outer layer of Cerebrum Cerebellum Hypothalamus Medulla oblongata Which of the following is not a part of cerebrum? Anterior lobe Frontal lobe Parietal lobe Occipital lobe Which part of the brain helps in controlling heart rate and blood pressure? Medulla oblongata Cerebrum Cerebellum Hypothalamus The scanners which can detect brain activity are fMRI MRI CT pCT Flexion and extension are examples of Antagonistic pairing of biceps and triceps Pumping of heart muscles Movement of quadriceps Movement of eye muscles Time is Up!