Q: Q: Where are hormones released? Read this paragraph and choose the correct option from the provided answers: Signaling molecules can belong to two broad groups. Neurotransmitters are released at synapses, whereas hormones are released into the bloodstream. These are simplistic definitions, but they can help to clarify this point. Acetylcholine can be considered a neurotransmitter because it is released by axons at synapses. The adrenergic system, however, presents a challenge. Postganglionic sympathetic fibers release norepinephrine, which can be considered a neurotransmitter. But the adrenal medulla releases epinephrine and norepinephrine into circulation, so they should be considered hormones. What are referred to here as synapses may not fit the strictest definition of synapse. Some sources will refer to the connection between a postganglionic fiber and a target effector as neuroeffector junctions; neurotransmitters, as defined above, would be called neuromodulators. The structure of postganglionic connections are not the typical synaptic end bulb that is found at the neuromuscular junction, but rather are chains of swellings along the length of a postganglionic fiber called a varicosity (Figure 15.5). Choices: - liver - lungs - brain - bloodstream A:
A: bloodstream

Q: Q: Where does the christmas tree worm live? Read this paragraph and choose the correct option from the provided answers: It is actually the Yellow Christmas tree worm. These animals are colorful, and can be red, orange, yellow, blue, and white. The Christmas tree worm lives on tropical coral reefs throughout the world. The Christmas tree worm's plumes are used for feeding and respiration. These worms use their plumes to catch plankton and other small particles passing in the water. Cilia then pass the food to the worm's mouth. Choices: - northeast coral reefs - Atlantic shoreline - rainforests - tropical coral reefs A:
A: tropical coral reefs

Q: Q: Nonflowering vascular plants have how many basic types of leaves? Read this paragraph and choose the correct option from the provided answers: Leaves may vary in size, shape, and their arrangement on stems. Nonflowering vascular plants have three basic types of leaves: microphylls ("tiny leaves"), fronds , and needles . Figure below describes each type. Choices: - four - one - five - three A:
A: three

Q: Q: Which gland is located in the sella turcica of the sphenoid bone within the cranial floor? Read this paragraph and choose the correct option from the provided answers: Figure 16.8 Pituitary Tumor The pituitary gland is located in the sella turcica of the sphenoid bone within the cranial floor, placing it immediately inferior to the optic chiasm. If the pituitary gland develops a tumor, it can press against the fibers crossing in the chiasm. Those fibers are conveying peripheral visual information to the opposite side of the brain, so the patient will experience "tunnel vision"meaning that only the central visual field will be perceived. Choices: - mammalian gland - thyroid gland - glucose gland - pituitary gland A:
A: pituitary gland