What is the primary function of red blood cells in the circulatory system?

A. The hypothalamus is posterior to the pituitary gland:The hypothalamus is actually superior (above) and connected to the pituitary; it is not located posterior to the pituitary.
B. The hypothalamus is located within the sella turcica:The sella turcica is the bony depression in the sphenoid bone that houses the pituitary gland, not the hypothalamus, which lies superior to it in the diencephalon.
C. The pituitary gland is superior to the hypothalamus:The pituitary lies inferior to the hypothalamus; it is not superior.
D. The pituitary gland is connected to the hypothalamus by the infundibulum:The infundibulum (pituitary stalk) physically connects the hypothalamus to the pituitary, allowing neural and vascular communication between them.

A. The endocrine system uses hormones for signaling, while the nervous system uses neurotransmitters.: The endocrine system releases chemical messengers (hormones) into the bloodstream that act on distant targets, while the nervous system transmits signals using neurons that release neurotransmitters at synapses for rapid, localized communication.
B. The endocrine system uses electrical signals, while the nervous system uses chemical signals.: The endocrine system relies on chemical hormones rather than electrical impulses; electrical signals are a primary feature of neuronal (nervous) communication.
C. The nervous system generates responses that take longer to occur compared to the endocrine system.: Nervous-system responses are typically rapid and short-lived because of fast electrical conduction and synaptic transmission, whereas endocrine responses are usually slower to start but longer-lasting.
D. Both systems use hormones for signaling but at different speeds.: While the endocrine system primarily uses hormones, the nervous system mainly uses electrical impulses and neurotransmitters; hormones can modulate neural function but the two systems do not both primarily use hormones.