The thymus cleanses the blood from the cardiovascular system of cellular debris and bacteria.
Answer the following statement true (T) or false (F)
False
The spleen cleanses the blood.
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The endocrine gland that produces hormones that help regulate blood calcium is the
A. pancreas. B. parathyroid gland. C. adrenal gland. D. pineal gland. E. testis.
All of the following are correctly matched "tissue system: function" except:
A. Ground tissue: anchors plant in the soil B. Dermal tissue: protects plant from pathogens and dessication C. Vascular tissue: moves molecules throughout plant's body D. All of these are correctly matched
In response to injury, cell fragments called platelets get activated to induce clotting. Activated platelets release factors that can in turn bind to specific membrane receptors on nearby cells. What type of signaling would this be considered?
A. endocrine B. direct contact C. paracrine D. autocrine E. synaptic
Primary producers obtain energy from a(n) __________ source and use it to build organic compounds from inorganic starting materials.
Fill in the blank(s) with the appropriate word(s).