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- Please answer 1 and 2. 1) Calcium enters the presynaptic neuron by: a) simple diffusion. b) facilitated diffusion. c) active transport. 2) Neurotransmitters directly affect: a)voltage-gated channels. b) ligand-gated channels. c) mechanosensitive channels.During the refractory period a) if a neuron reaches threshold the action potential goes to completion b) No stimulus of any strength will trigger a new action potential c) It is possible to trigger a new action potential but only with an unusually strong stimulus d) The signal grows weaker with distance e) The neuron fires at its maximum voltage if a stimulus depolarizes the neuron to thresholdA) The following structure in the figure is a receptor for sensory information: A, B, C, D, E, F, G, H, I, J, K, L, M, N, O B)The following structure in the figure is an interneurone: A, B, C, D, E, F, G, H, I, J, K, L, M, N, O C)The following structure in the figure will carry information to skeletal muscle: A, B, C, D, E, F, G, H, I, J, K, L, M, N, O
- Binding of neurotransmitter to the motor end plate leads to depolarization because the neurotransmitter: a) opens ligand-gated sodium channels. b) opens voltage-gated sodium channels. c) opens ligand-gated potassium channels. d) opens voltage-gated potassium channels.Neurons typically receive information at structures called Question 1 options: A) Myelin B) Dendrites C) Neuroglia D) Axons E) Axon hillocks10) which of the following definitions does not match the neuron structure? a) cell body;integrating center of the neuron b) axon; structure which sends the impulse c) dendrite; structure which receives the impulse d) dendrite; structure which sends the impulse
- Cellular disarray in the nerve cells of a person with schizophrenia means that the nerve cells appear: Question 5 options: a) Smaller b) Larger c) Organized d) Disorganized1. If you block calcium channels on an axon, which will not occur? A) exocytosis of neurotransmitter B) repolarization phase of the action potential C) depolarization phase of the action potential D) hyperpolarization phase of the action potential E) graded potentialA neurotransmitter that is the most widespread inhibitory neurotransmitter in the brain is _________. A) Group of answer choices B) Glutamate C) Serotonin D) Neuropeptide Y E) GABA F) Dopamine
- The level of depolarization at which an action potential will be triggered is referred to as the Multiple Choice a) cationic potential. b) membrane potential. c) threshold potential. d) refractory potential. e) resting potential.Generally, for a positive feedback arc to cause a change of a physiological variable, where must be the receptor? Multiple answers: Choose all of the relevant answers from the choices below. answer choices a)Intracellular fluid b)Intersitial fluid c)Extracellular fluid d)External environment (e.g., mother's nipple) e)Blood plasma 2)Which of the following is NOT true regarding negative feedback loops and homeostasis? answer choices a. Homeostatic control systems cannot maintain complete constancy of the internal environment b. The set point of some variable can be reset c. It is always possible for physiological variables to be maintained in a relatively constant manner using homeostatic control systems d. The stability of an internal environment variable is achieved by balancing inputs and outputs e. In negative feedback systems, a change in the variable being regulated brings about responses that tend to move the variable in a direction that is opposite to the…What division of the nervous system drives increased contraction of the muscle of the urinary bladder? A) somatic motor B) special sensory C) parasympathetic D) somatic sensory