Carbon monoxide is dangerous when inhaled in excess. Comment on the statement.

The immediate steps to be taken when a person suffers a heart attack are: P. Loosen the clothes Q. Make the person lie down in an airy place R. Take the person to the hospital S. Encourage conversation (a) P and Q (b) P and S (c) R and S (d) P, Q and R

Pick the odd one out and name the category to which the remaining three belong: (a) Prothrombin, Thrombin, Fibrinogen, Albumin (b) Tonsils, Glomerulus, Spleen, Lymph nodes (c) Neutrophils, Basophils, Monocytes, Eosinophils (d) Leaves, Styrofoam, Grass, Cow dung (e) Pulmonary artery, Renal artery, Coronary artery, Hepatic artery

Name the mineral elements required for: (a) Clotting of blood (b) Synthesis of thyroxine

Mention two structural differences between an artery and a vein.

Give the exact location of: (a) Pericardium (b) Bicuspid valve

Assertion (A): Leukoderma is the biological term for blood cancer. Reason (R): An abnormal increase in the number of WBCs causes blood cancer. (a) (A) is true and (R) is false. (b) (A) is false and (R) is true. (c) Both (A) and (R) are true and (R) is the correct explanation of (A). (d) Both (A) and (R) are true and (R) is not the correct explanation of (A).

The diagram below depicts the human heart in one of its phases. Answer the questions that follow: (a) Which part of the heart is in the contraction phase? (b) Give a suitable reason to justify your answer in (a). (c) Distinguish between Systole and Diastole.

During the ventricular systole, the atrioventricular valves (P) ............... and the semilunar valves (Q) ............... . (a) P-close and Q-open (b) P-close and Q-close (c) P-open and Q-close (d) P-open and Q-open

Arrange the terms in each group in the correct order. Write them in a logical sequence beginning with the term that is underlined. (a) Palisade cells, Cuticle, Upper epidermis, Spongy cells. (b) Hepatic portal vein, Stomach, Hepatic vein, Liver. (c) Cyton, Dendrites, Synaptic cleft, Axon endings. (d) Insulin release, High blood sugar, Lowers blood sugar, Stimulates glucose uptake from blood. (e) Sperm duct, Seminiferous tubule, Epididymis, Efferent ducts.

RBCs do not have nuclei. Discuss its advantage.

Which is the correct sequence of blood flow in the Pulmonary and Systemic circulation? (a) Right Atrium → Right Ventricle → Lungs → Left Atrium → Left Ventricle → Body tissues (b) Left Ventricle → Left Atrium → Body tissues → Right Atrium → Right Ventricle → Lungs (c) Left Ventricle → Left Atrium → Lungs → Right Ventricle → Right Atrium → Body tissues (d) Right Atrium → Right Ventricle → Body tissues → Left Atrium → Left Ventricle → Lungs