Question

Describe the blood circulatory system of cockroach in detail ​

Answer 1

Cockroaches are invertebrates falling under the phylum arthropoda. They are insects with jointed legs.

*Cockroaches have blood vascular system with poorly developed blood vessels which open into a haemocoel or open body space.

*Visceral organs are immersed in haemolymph or blood of cockroach. *Haemolymph comprises colourless plasma and haemocytes.

*Longitudinal section of the cockroach shows a long muscular tube lying in the mid-dorsal side of the body called as heart.

*It is differentiated into ostia on either side.

*Cockroaches also have pericardial sinus(dorsal sinus), perineural sinus (ventral sinus) and perivisceral sinus of middle sinus in their body.

*Haemolymph from the sinuses enters the heart through ostia and is pumped back into the sinuses anteriorly.

HOPE IT HELPS............

Answer 2

HLO MATE HERE U GO..

❤. BLOOD CIRCULATORY SYSTEM OF PERILPLANETA❤

• The circulatory system transports digested food , hormones from one part of the body to other parts of the body.
• The blood flows freely in spaces of haemociel.Hence this circulatory system is open type.

The three main parts of circulatory system are

a) Haemocoel b) Heart c) Blood.

❤. HAEMOCOEL ❤

• It is divided into tree sinuses by two horizontal muscular membranes called dorsal diaphragm and ventral diaphragm.
• Both the diaphragms have valvular pores.
• There is a series of paired triangular muscles , called alary muscles.
• One pair of muscles are present in each segment , on the lateral sides of the body.
• The dorsal diaphragm is between pericardial sinus and perivisceral sinus.
• The ventral diaphragm is between perivisceral sinus and perineural sinus.
• pericardial sinus surrounds visceral organs.
• Perivisceral sinus surrounds visceral organs.
• Perineural sinus surrounds ventral nerve cord.
• Perivisceral sinus is large and other two are small.

❤. HEART ❤

• The heart is dorsal. It is present below the tergal plates surrounded by pericardial sinus.
• It is long , muscular , contractile , 13 chambered tube.
• Every chamber opens into its anterior chamber by a valvular openinv.
• The posterior end of heart is closed and opens anteriorly into aorta.
• At posterior side of each chamber , except the last , there is a pair of small apertures called 'ostia', one on each side.
• Ostia have valves which allow the blood to pass only into the heart from the dorsal sinus .

❤. BLOOD ( Haemolymph)❤

• The blood of periplaneta is colourless and called haemolymph.
• It consistd of plasma and phagocytic haemocytes.
• There is no respiratory pigment in tge blood and so it plays no major role in respiration.

❤. IMPORTANT FUNCTIONS OF BLOOD ❤

• Blood absorbs and distributes digested food.
• It transports nitrogenous wastes from various parts of the body to excretory organs.
• It carries phagocytes to the places of infection.
• It transports hormones to target organs.

❤. CIRCULATION OF BLOOD ❤

• Blood flows from heart to aorta and to head sinus by contraction of heart muscles.From head sinus, blood flows into perivisceral and perineural sinuses.
• Alary muscles contract pulling down the pericardial septum.Blood flows into pericardial sinus.
• Alsry muscles relax and pericardial septum moves up forcing blood into heart and circulation continues.