- Bicycling on the road - voluntary action
- Beating of the heart - involuntary but non-reflexive action
- Jumping when startled by a loud horn - reflexive action
- Blinking your eyes every few seconds - reflexive action controlled by the brain
Reflexive actions are the simple and fundamental movements. Those are automatic muscle responses to particular stimuli. Examples: removing the arm when it burns, moving the feet when it step tt a sharp object etc.
Voluntary actions are under the control of the brain which “orders” and sends information to motor cortex to perform the movement. Examples: arm and leg moving, doing any sport etc.
Involuntary actions are made without the intermediation of the brain. Examples: crying, blinking, breathing, heart beating etc.
In the context of the neural impulse, the membrane that encases the axon is called semipermeable because FLUIDS CAN SOMETIMES FLOW INTO OR OUT OF IT.
Semi permeability is the ability of the membrane to allow certain substances, not all, to pass through it.
True.
In the process of the nitrogen cycle. <span>
The nitrogen cycle is a biogeochemical succession process of nitrogen that involves: fixation, ammonification, nitrification, and denitrification. Like any other biogeochemical cycles. This process undergoes and affects the biological, geometrical and chemical aspects in the ecosystem and the abiotic and biotic community. Hence, the nitrogen cycle leads the abiotic component –nitrogen- to contribute to the biotic community, decomposition and primal production. Further, it becomes an essential part of the environment because some life components are contains it, similarly, amino acids, nucleic acids in RNA and DNA. </span><span>
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Answer:
They are smaller than blood capillaries.
Explanation:
Lymphatic capillaries drains the extracellular fluid present between the cell spaces. The fluid is known as lymph as it enters the lymph capillaries. These capillaires drains into lymph vessels that drains to lymph nodes and lymph ultimately enters the venous circulation.
Lymphatic capillaries are slightly larger than blood vessels and these capillaries have close ends. The walls of lymph capillaries are made up of endothelial cells. The endothelial cells overlap in lymph vessels and when the pressure in ECF is greater these cells move and create a sort of gap for the movement of ECF inside the lymph capillary but when the pressure inside the capillary is greater these cells again overlap and does not allow the lymph to move outside of capillary. Thus lymph capillaries only allow the ECF to enter the capillary but does not allow the lymph to go out from capillary. Lymph capillaries have greater internal pressure than blood vessels.
Answer:Lipids-Component of cell membranes
Protein-Store genetic energy
Carbohydrates-Structure of cell walls
Nucleic acids-Provide energy for the cell
Explanation: