Stem cells in the bone marrow leave there and start dividing to provide the blood with needed cells such as neutrophils. Programmed cell death is an important regulatory mechanism in controlling the number and type of blood cells present in the blood. Older blood cells are removed by the spleen. Cadherins allow cells to adhere to the extracellular matrix. Tight junctions are only found in epithelia.
Cell junctions help regulate cell proliferation.
Integrins and cadherins can each connect to the actin cytoskeleton. Desmosomes and hemidesmosomes are the most important junctions for giving mechanical strength to a tissue. Describe four different types of thermoregulation mechanisms that are used by endothermic animals. Change rate of metabolic heat production Adjust rate of heat exchange with environment via vasoconstriction or vasodilation of vessels near the site Cooling by evaporative loss Behavioral responses 19. Provide a detailed explanation for why this is helpful to a fish.