je veus savoir definir en sciences un recepteur, un effecteur, une stimulation, un nerf sensitif Flashcards
(25 cards)
What is a receptor in the context of science?
A receptor is a protein molecule that receives and responds to chemical signals from outside a cell.
What role does an effector play in biological systems?
An effector is a muscle or gland that responds to signals from the nervous system to produce a specific effect.
Define stimulation in a scientific context.
Stimulation refers to the process of activating a receptor or a nerve, leading to a response in the organism.
True or False: A sensory nerve transmits signals from the central nervous system to effectors.
False
What is the primary function of a sensory nerve?
A sensory nerve transmits sensory information from receptors to the central nervous system.
Fill in the blank: A ________ is a structure that detects changes in the environment.
receptor
What type of signal do receptors respond to?
Receptors respond to chemical signals, light, temperature, or mechanical pressure.
Multiple Choice: Which of the following is NOT an effector? A) Muscle, B) Gland, C) Neuron, D) Organ
C) Neuron
How do effectors contribute to homeostasis?
Effectors help maintain homeostasis by responding to signals and adjusting bodily functions accordingly.
True or False: Stimulation can only occur through physical means.
False
What is the relationship between receptors and stimulation?
Receptors are activated by stimulation, which leads to a signal being sent to the central nervous system.
Fill in the blank: Sensory nerves carry information from ________ to the brain.
receptors
Define the term ‘effector organ’.
An effector organ is any organ that produces a physiological response upon stimulation.
Multiple Choice: Which of the following is a type of receptor? A) Photoreceptor, B) Motor neuron, C) Hormone, D) Effector
A) Photoreceptor
What is the main purpose of stimulation in biological systems?
The main purpose of stimulation is to initiate a response in an organism that allows it to react to environmental changes.
True or False: All receptors are located on the surface of cells.
False
What happens when a receptor is stimulated?
When a receptor is stimulated, it undergoes a conformational change that initiates a cellular response.
Fill in the blank: ________ are responsible for carrying signals from the brain to muscles.
Motor nerves
What are the two main types of effectors?
The two main types of effectors are muscles and glands.
Define a sensory receptor.
A sensory receptor is a type of receptor that detects specific types of stimuli, such as light, sound, or pressure.
Multiple Choice: Which statement best defines stimulation? A) It is the process of ignoring stimuli, B) It is the activation of a receptor, C) It is the response of an effector, D) It is the transmission of nerve signals.
B) It is the activation of a receptor
What is the function of a motor neuron?
A motor neuron transmits signals from the central nervous system to effectors, such as muscles and glands.
True or False: Receptors can only detect one type of stimulus.
False
What is the role of neurotransmitters in stimulation?
Neurotransmitters are chemicals that transmit signals across synapses from one neuron to another, facilitating stimulation.
