Vitamin A is pass through proteins to go from outside the cell to inside
The primary reproductive organs are the gonads, which produce the gametes and hormones. The secondary, or accessory, structures transport and sustain the gametes and nurture the developing offspring. Organs of excretion include the skin , liver , large intestine , lungs , and kidneys (see Figure 16.2. 2). Together, these organs make up the excretory system . They all excrete wastes, but they don't work together in the same way that organs do in most other body systems.
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