In light dependent reactions.
Sacs
In worms, sperm sacs serve as the storage site for sperm produced by the male reproductive system. These sacs store the sperm until it is transferred to the female during mating, allowing for efficient fertilization of eggs.
Birds breathe with lungs, in and out through beak and nostrils - pretty much like we do. Some have a sort of secondary system as well, with air sacs and even their hollow bones playing a role - but most it with lungs.
The endomembrane system is a network of flattened sacs and vesicles found within eukaryotic cells. It includes the endoplasmic reticulum, Golgi apparatus, lysosomes, and vesicles involved in transport and secretion. This system plays a key role in protein synthesis, modification, packaging, and transport within the cell.
Inhaled air passes through the primary bronchus, and most enters the posterior air sacs as well as the lungs. During this passage, air that was in the posterior air sacs moves through the lungs air capillaries so that exchange takes place. During exhalation, the air in the posterior air sacs passes through the lung en route to the external environment. Again exchange goes on during exhalation.
chlorophyll molecules sit on the outside of the thylakoid sacs.
They are in thylakoid membranes.They are flattened sacs
Granum
They are in thylakoid sacs.They are flattened sacs.
the thylakoids
The internal membrane of the chloroplast that is organized into flattened membranous sacs is called the thylakoid membrane. These membranes contain chlorophyll and other pigments involved in the light-dependent reactions of photosynthesis.
Chlorophyll is found in the thylakoid membrane.
chloroplasts
Granum
The place where light reactions occurs are the grana. These are composed of thylakoid sacs that are stacked and embedded in the chloroplast.
stroma
Photosynthesis takes place in structures called chloroplasts, which contain sac-like structures called thylakoids. Thylakoids are arranged in stacks called grana, where the light-dependent reactions of photosynthesis occur.