Question

air sacs are thin walled are many in number give 5 reasons​

Answer 1

Answer:

These air sacs have fine membranous walls surrounded by equally thin-walled capillaries which allow gas exchange to occur. In order for the lungs to expand and contract, the thoracic cavity lengthens and shortens due to the rise …

Answer 2

Mitochondria may have a number of different shapes.[23] A mitochondrion contains outer and inner membranes composed of phospholipid bilayers and proteins.[17] The two membranes have different properties. Because of this double-membraned organization, there are five distinct parts to a mitochondrion:

the outer mitochondrial membrane,

the intermembrane space (the space between the outer and inner membranes),

the inner mitochondrial membrane,

the cristae space (formed by infoldings of the inner membrane), and

the matrix (space within the inner membrane).

Mitochondria stripped of their outer membrane are called mitoplasts.