Electron carrier molecules transfer electrons between metabolic pathways. Choose the electron carriers that transfer electrons from glycolysis to the electron transport chain and from the citric acid cycle to the electron transport chain. One of the molecules will be placed more than once. More than one molecule may act as an electron carrier in these two pathways.

from glycolysis to electron transport.-glycolytic pathway

NADH  and FADH2 are the major electron carrier   from glycolysis through the Kreb Cycle to the electron transport chain.

Note-NADH  alone transports electron  from glycolysis  to the Kreb Cycle. while both   NADH and FADH2  transport electrons   from the kreb'cycle  to the electron transport chain.

from citric ac id cycle to the electron transport chain.

as explained above both NADH and FADH2.

The electrons are  in the hydrogen atoms, carried by these co-enzymes. When they reached the matrix, the hydrogen atoms are split into protons and electrons(p and e-). it is these electrons that form gradients which are transported as chains in the matrix. The gradients of the electron generated PMF for pumping Hydrogen atoms into the intramembrane of mitochondrial

Note.

Nicotinamide Adenine Di nucleotide Hydrogen(NADH)

Flavin Adenine Dinucleotide Hydrogen(FADH)

Explanation:

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

i hope this : )